Eliciting Risk Perceptions: Does Conditional Question Wording Have a Downside?

BACKGROUND: To assess the impact of risk perceptions on prevention efforts or behavior change, best practices involve conditional risk measures, which ask people to estimate their risk contingent on a course of action (e.g., "if not vaccinated"). PURPOSE: To determine whether the use of conditional wording-and its drawing of attention to one specific contingency-has an important downside that could lead researchers to overestimate the true relationship between perceptions of risk and intended prevention behavior. METHODS: In an online experiment, US participants from Amazon's MTurk (N = 750) were presented with information about an unfamiliar fungal disease and then randomly assigned among 3 conditions. In all conditions, participants were asked to estimate their risk for the disease (i.e., subjective likelihood) and to decide whether they would get vaccinated. In 2 conditional-wording conditions (1 of which involved a delayed decision), participants were asked about their risk if they did not get vaccinated. For an unconditional/benchmark condition, this conditional was not explicitly stated but was still formally applicable because participants had not yet been informed that a vaccine was even available for this disease. RESULTS: When people gave risk estimates to a conditionally worded risk question after making a decision, the observed relationship between perceived risk and prevention decisions was inflated (relative to in the unconditional/benchmark condition). CONCLUSIONS: The use of conditionals in risk questions can lead to overestimates of the impact of perceived risk on prevention decisions but not necessarily to a degree that should call for their omission. HIGHLIGHTS: Conditional wording, which is commonly recommended for eliciting risk perceptions, has a potential downside.It can produce overestimates of the true relationship between perceived risk and prevention behavior, as established in the current work.Though concerning, the biasing effect of conditional wording was small-relative to the measurement benefits that conditioning usually provides-and should not deter researchers from conditioning risk perceptions.More research is needed to determine when the biasing impact of conditional wording is strongest.

Successful implementation of ITN distribution through health facilities in Ghana.

BACKGROUND: Global efforts to reduce malaria burden include distribution of insecticide-treated mosquito nets through mass campaigns and routine channels. Ghana's National Malaria Elimination Programme (NMEP) distributes insecticide-treated bed nets (ITNs) through various channels, including to pregnant women at antenatal care (ANC) visits and children at vaccination visits through child welfare clinics (CWC). This study assessed historical ITN distribution throughout ANCs and CWCs across Ghana and the characteristics of high performing facilities. METHODS: Monthly data on routine ITN distribution was provided from Ghana's national health information management system for the years 2016-2021. Analyses were conducted to assess the performance of ITN distribution at ANC and CWC across time, ecological zone, regions, districts, facility ownership, and facility type. Univariate and multivariate logistic regressions were performed to predict the odds of ANC and CWC issuing rates greater or equal to 80% for a given facility type or ownership. RESULTS: In 2021, 93% of women who attended their first antenatal care visit and 92% of children under five who received their second dose of the measles-rubella vaccine (MR2) had received an ITN. At the regional level, 94% of regions (n = 15/16) maintained the NSP target issuing rate of 80% throughout 2020 and 2021. While there were no clear differences in issuing rates between ecological zones, district-level differences were present across the six years. All health facility types performed at or above 80% in 2021 for both ANC and CWC. Odds ratios demonstrated differences in the likelihood of meeting the 80% issuing rate goal among different facility types as well as private versus public ownership when comparing ANC and CWC. CONCLUSION: By 2021, Ghana had improved its ITN issuing rates since the initial year of analysis, surpassing the 80% target by issuing nets to over 90% of pregnant women and young children attending ANC and CWC. Future work can explore the reasons for national and subnational differences in issuing rates as well as help understand additional characteristics of high performing facilities. Additionally, it is necessary to identify and expand on the drivers for improved performance over the time period.

Measuring quality of facility-based ITN distribution in Ghana.

BACKGROUND: Continuous distribution channels are effective methods to deliver malaria interventions such as insecticide treated nets (ITNs) to pregnant women attending antenatal care clinics and children under five attending immunization visits. Facility-based and provider-based checklists were used during supportive supervision visits to measure the quality of facility-based services and interventions. This study looks at ITN distributions at health facilities in Ghana, with the aim of providing insights on how quality can be measured and monitored. METHODS: Various quality improvement approaches for malaria services occur in Ghana. Selected indicators were analysed to highlight the similarities and differences of how the approaches measured how well the channel was doing. Generally, the approaches assessed (1) service data management, (2) logistics data management, and (3) observation of service provision (ITN issuance, malaria education, ITN use and care education). Two approaches used a binary (Yes/No) scale, and one used a Likert scale. RESULTS: Results showed that most data reported to the national HMIS is accurate. Logistics data management remained an issue at health facilities, as results showed scores below average across facility stores, antenatal care, and immunization. Though the supervision approaches differed, overall results indicated that almost all eligible clients received ITNs, data were recorded accurately and reported on-time, and logistics was the largest challenge to optimal distribution through health facilities. CONCLUSION: The supervision approaches provided valuable insights into the quality of facility-based ITN distribution. Ghana should continue to implement supportive supervision in their malaria agenda, with additional steps needed to improve reporting of collected data and increase the number of facilities visited for supportive supervision and the frequency. There were various supervision approaches used with no clear guidance on how to measure quality of facility-based ITN distribution, so there is also need for the global community to agree on standardized indicators and approaches to measuring quality of facility-based ITN distribution. Additionally, future studies can review the effect of multiple rounds of supervision visits on the quality of ITN distribution as well as understand the facilitators and barriers to scaling up supervision of facility-based ITN distribution.

People express more bias in their predictions than in their likelihood judgments.

The desirability bias refers to when people's expectations about an uncertain event are biased by outcome preferences. Prior work has provided limited evidence that the magnitude of this motivated bias depends on (is moderated by) how expectations are solicited-as discrete outcome predictions or as likelihood judgments expressed on more continuous scales. The present studies extended the generalizability and understanding of the moderating process. The authors proposed that solicitations of predictions and likelihood judgments have different connotations that ultimately affect how much bias is expressed; this varies from a prior account that attributed the moderation effect to response scale differences (dichotomous vs. continuous). Study 1 confirmed the connotation difference, with predictions being viewed as more affording of hunches. Studies 2-4 directly tested the moderation effect, and unlike prior work focusing on expectations for purely stochastic events, the present studies involved more naturalistic events for which likelihood information was not supplied or directly knowable. Before viewing scenes from a basketball game (Study 2) or an endurance race (Studies 3 and 4), participants were led to prefer one contestant over another. After viewing most of the closely fought contest, they made either a prediction or likelihood judgment about the outcome. Participants' tendency to forecast their preferred contestant to win was significantly stronger among those making predictions rather than likelihood judgments. In support of the proposed account, this effect persisted even when both types of solicitations offered only dichotomous response options. Broader implications for measuring and understanding people's expectations or forecasts are discussed. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Multi-country review of ITN routine distribution data: are ANC and EPI channels achieving their potential?

BACKGROUND: Routine continuous distribution (CD) of insecticide-treated nets (ITNs) has been an important part of an overall ITN strategy to complement mass campaigns since the early 2000s. The backbone of CD implementation for many sub-Saharan African countries is distribution through antenatal care (ANC) and Expanded Programme for Immunizations (EPI) channels. Performance of these channels is often not monitored closely at the national level, nor is it reviewed globally, unlike the oversight provided to mass campaigns. The question as to why every eligible pregnant woman and child attending these services does not get an ITN remains important and yet, unanswered. METHODS: ANC and EPI issuing rates from seven countries were reviewed with the aim of conducting a blinded multi-country analysis. Monthly data from January to December 2021 was extracted from each country's health management information system and analysed jointly with a National Malaria Control Programme (NMCP) focal point. VectorLink CD assessment reports were also reviewed to glean key findings. RESULTS: ITN issuing rates varied across countries at ANC (31% to 93%) and EPI (39% to 92%). Across the seven countries, the median ITN issuing rate was 64% at ANC and 78% at EPI. Results varied greatly across months per country at both ANC and EPI. NMCP focal points are aware that mass campaigns often negatively affect implementation of ITN distribution through ANC and EPI, even though global and national guidelines emphasize sustaining CD during campaigns. Concerns were also raised about the standard ITN issuing rate indicator at ANC and even more so at EPI due to the denominator. Findings from CD assessments were similar across countries: ITN stock was inconsistent and sometimes inadequate, and updated guidelines on ITN distribution and utilization and funding for social behaviour change activities were lacking at the facility level. CONCLUSION: The importance of optimizing ANC and EPI routine channels cannot be underscored enough. They are at the frontline to protect the most biologically vulnerable populations, i.e., pregnant women and unborn and young children. Although there are encouraging signs of improvement in issuing rates with some countries reaching optimal rates, further improvements are needed to ensure that every pregnant woman and young child receives the ITN to which they are entitled.

The desirability bias in predictions under aleatory and epistemic uncertainty.

The desirability bias (or wishful thinking effect) refers to when a person's desire regarding an event's occurrence has an unwarranted, optimistic influence on expectations about that event. Past experimental tests of this effect have been dominated by paradigms in which uncertainty about the target event is purely stochastic-i.e., involving only aleatory uncertainty. In six studies, we detected desirability biases using two new paradigms in which people made predictions about events for which their uncertainty was both aleatory and epistemic. We tested and meta-analyzed the impact of two potential moderators: the strength of evidence and the level of stochasticity. In support of the first moderator hypothesis, desirability biases were larger when people were making predictions about events for which the evidence for the possible outcomes was of similar strength (vs. not of similar strength). Regarding the second moderator hypothesis, the overall results did not support the notion that the desirability bias would be larger when the target event was higher vs. lower in stochasticity, although there was some significant evidence for moderation in one of the two paradigms. The findings broaden the generalizability of the desirability bias in predictions, yet they also reveal boundaries to an account of how stochasticity might provide affordances for optimistically biased predictions.

Do People Prescribe Optimism, Overoptimism, or Neither?

Past work has suggested that people prescribe optimism-believing it is better to be optimistic, instead of accurate or pessimistic, about uncertain future events. Here, we identified and addressed an important ambiguity about whether those findings reflect an endorsement of biased beliefs-that is, whether people prescribe likelihood estimates that reflect overoptimism. In three studies, participants (N = 663 U.S. university students) read scenarios about protagonists facing uncertain events with a desired outcome. Results replicated prescriptions of optimism when we used the same solicitations as in past work. However, we found quite different prescriptions when using alternative solicitations that asked about potential bias in likelihood estimations and that did not involve vague terms such as "optimistic." Participants generally prescribed being optimistic, feeling optimistic, and even thinking optimistically about the events, but they did not prescribe overestimating the likelihood of those events.

Long-term sequelae of mothers' and fathers' mind-mindedness in infancy: A developmental path to children's attachment at age 10.

Rapidly growing research on parental mind-mindedness, a tendency to treat one's young child as a psychological agent and an individual with a mind, internal mental states, and emotions, has demonstrated significant links among parents' mind-mindedness, their parenting, and multiple aspects of children's development. This prospective longitudinal study of 102 community mothers, fathers, and infants, followed from 7 months to 10 years, contributes to research on mind-mindedness by addressing several existing gaps and limitations. We examine mechanisms that account for associations between parents' early mind-mindedness and children's future attachment security, using robust behavioral measures. Teams of trained observers coded parents' mind-minded comments to their infants at 7 months during naturalistic interactions, parents' responsiveness in naturalistic interactions and in elicited imitation tasks at 15 months, and children's security, using Attachment Q-Set at 2 years and Iowa Attachment Behavioral Coding at 10 years. Sequential mediation analyses supported a model of a developmental path from parents' appropriate mind-minded comments in infancy to children's security at age 10. For mothers and children, the path was mediated first through responsiveness at 15 months and then security at 2 years. For fathers and children, the path was mediated through attachment security at 2 years. Parents' nonattuned mind-minded comments had no effects on responsiveness or security. (PsycINFO Database Record (c) 2019 APA, all rights reserved).

How Much Time Do Families Spend on the Health Care of Children with Diabetes?

INTRODUCTION: Family time caring for children with diabetes is an overlooked component of the overall burden of the condition. We document and analyze risk factors for time family members spend providing health care at home and arranging/coordinating health care for children with diabetes. METHODS: Data for 755 diabetic children and 16,161 non-diabetic children whose chronic conditions required only prescription (Rx) medication were from the 2009-2010 United States National Survey of Children with Special Health Care Needs (NS-CSHCN). We used generalized ordered logistic regressions to estimate adjusted odds ratios (AORs) of time burden by diabetes, insulin use, and stability of the child's health care needs, controlling for health and socioeconomic status. RESULTS: Nearly one-quarter of diabetic children had family members who spent 11+ h/week providing health care at home, and 8% spent 11+ h/week arranging/coordinating care, compared with 3.3% and 1.9%, respectively, of non-diabetic Rx-only children. Time providing care at home for insulin-using children was concentrated in the higher time categories: AORs for insulin-using diabetic compared to non-diabetic Rx-only children were 4.4 for 1+ h/week compared with <1 h/week, 9.7 for 6+ vs. <6 h, and 12.4 for 11+ vs. <11 h (all P < 0.05); the pattern was less pronounced for non-insulin-using children. AORs for arranging/coordinating care did not vary by time contrast: AOR = 4.2 for insulin-using, 3.0 for non-insulin-using children. CONCLUSION: Health care providers, school personnel, and policymakers need to work with family members to improve care coordination and identify other ways to reduce family time burdens caring for children with diabetes.

Risk factors for family time burdens providing and arranging health care for children with special health care needs: Lessons from nonproportional odds models.

We identify need, enabling, and predisposing factors for high family time burdens associated with the health care of chronically-ill children, using data from the U.S. 2009-2010 National Survey of Children with Special Health Care Needs (NS-CSHCN), a population-based survey of 40,242 children with special health care needs (CSHCN). We estimate generalized ordered logistic multivariable regressions of time spent (1) providing health care for the child at home, (2) arranging/coordinating health care, and (3) combined time. Factors associated with higher time burdens included child's functional limitations, severe or unstable health conditions, public health insurance, lack of a medical home, low family income, low adult education, and non-white race. Nonproportional odds models revealed associations between risk factors and time burden that were obscured by binary and standard ordered logistic models. Clinicians and policymakers can use this information to design interventions to alleviate this important family stressor.

Which components of medical homes reduce the time burden on families of children with special health care needs?

OBJECTIVES: To examine which components of medical homes affect time families spend arranging/coordinating health care for their children with special health care needs (CSHCNs) and providing health care at home. DATA SOURCES: 2009-2010 National Survey of Children with Special Health Care Needs (NS-CSHCN), a population-based survey of 40,242 CSHCNs. STUDY DESIGN: NS-CSHCN is a cross-sectional, observational study. We used generalized ordered logistic regression, testing for nonproportional odds in the associations between each of five medical home components and time burden, controlling for insurance, child health, and sociodemographics. DATA COLLECTION/EXTRACTION METHODS: Medical home components were collected using Child and Adolescent Health Measurement Initiative definitions. PRINCIPAL FINDINGS: Family-centered care, care coordination, and obtaining needed referrals were associated with 15-32 percent lower odds of time burdens arranging/coordinating and 16-19 percent lower odds providing health care. All five components together were associated with lower odds of time burdens, with greater reductions for higher burdens providing care. CONCLUSIONS: Three of the five medical home components were associated with lower family time burdens arranging/coordinating and providing health care for children with chronic conditions. If the 55 percent of CSHCNs lacking medical homes had one, the share of families with time burdens arranging care could be reduced by 13 percent.

A cluster-randomized controlled trial to assess the effectiveness of using 15% DEET topical repellent with long-lasting insecticidal nets (LLINs) compared to a placebo lotion on malaria transmission.

BACKGROUND: Long-lasting insecticidal nets (LLINs) have limited effect on malaria transmitted outside of sleeping hours. Topical repellents have demonstrated reduction in the incidence of malaria transmitted in the early evening. This study assessed whether 15% DEET topical repellent used in combination with LLINs can prevent greater malaria transmission than placebo and LLINs, in rural Tanzania. METHODS: A cluster-randomized, placebo-controlled trial was conducted between July 2009 and August 2010 in a rural Tanzanian village. Sample size calculation determined that 10 clusters of 47 households with five people/household were needed to observe a 24% treatment effect at the two-tailed 5% significance level, with 90% power, assuming a baseline malaria incidence of one case/person/year. Ten clusters each were randomly assigned to repellent and control groups by lottery. A total of 4,426 individuals older than six months were enrolled. All households in the village were provided with an LLIN per sleeping space. Repellent and placebo lotion was replaced monthly. The main outcome was rapid diagnostic test (RDT)-confirmed malaria measured by passive case detection (PCD). Incidence rate ratios were estimated from a Poisson model, with adjustment for potential confounders, determined a priori. According-to-protocol approach was used for all primary analyses. RESULTS: The placebo group comprised 1972.3 person-years with 68.29 (95% C.I 37.05-99.53) malaria cases/1,000 person-years. The repellent group comprised 1,952.8 person-years with 60.45 (95% C.I 48.30-72.60) cases/1,000 person-years, demonstrating a non-significant 11.44% reduction in malaria incidence rate in this group, (Wilcoxon rank sum z=0.529, p=0.596). Principal components analysis (PCA) of the socio-economic status (SES) of the two groups demonstrated that the control group had a higher SES (Pearson's chi square=13.38, p=0.004). CONCLUSIONS: Lack of an intervention effect was likely a result of lack of statistical power, poor capture of malaria events or bias caused by imbalance in the SES of the two groups. Low malaria transmission during the study period could have masked the intervention effect and a larger study size was needed to increase discriminatory power. Alternatively, topical repellents may have no impact on malaria transmission in this scenario. Design and implementation of repellent intervention studies is discussed. TRIAL REGISTRATION: The trial was registered ISRCTN92202008--http://www.controlled-trials.com/ISRCTN92202008.

Reasons for unmet need for child and family health services among children with special health care needs with and without medical homes.

OBJECTIVES: Medical homes, an important component of U.S. health reform, were first developed to help families of children with special health care needs (CSHCN) find and coordinate services, and reduce their children's unmet need for health services. We hypothesize that CSHCN lacking medical homes are more likely than those with medical homes to report health system delivery or coverage problems as the specific reasons for unmet need. METHODS: Data are from the 2005-2006 National Survey of Children with Special Health Care Needs (NS-CSHCN), a national, population-based survey of 40,723 CSHCN. We studied whether lacking a medical home was associated with 9 specific reasons for unmet need for 11 types of medical services, controlling for health insurance, child's health, and sociodemographic characteristics. RESULTS: Weighted to the national population, 17% of CSHCN reported at least one unmet health service need in the previous year. CSHCN without medical homes were 2 to 3 times as likely to report unmet need for child or family health services, and more likely to report no referral (OR= 3.3), dissatisfaction with provider (OR=2.5), service not available in area (OR= 2.1), can't find provider who accepts insurance (OR=1.8), and health plan problems (OR=1.4) as reasons for unmet need (all p<0.05). CONCLUSIONS: CSHCN without medical homes were more likely than those with medical homes to report health system delivery or coverage reasons for unmet child health service needs. Attributable risk estimates suggest that if the 50% of CSHCN who lacked medical homes had one, overall unmet need for child health services could be reduced by as much as 35% and unmet need for family health services by 40%.

Unmet need, cost burden, and communication problems in SCHIP by special health care needs status.

Children with special health care needs (CSHCN) require more health care than other children; hence adequate health insurance is critical. The Maternal and Child Health Bureau defined three components of adequacy: (1) coverage of needed benefits and services; (2) reasonable costs; and (3) ability to see needed providers. This study compares cost burden, access to care, and patient/provider communication within New Jersey's SCHIP for CSHCN versus those without such needs. We used data from the 2003 NJ FamilyCare (NJFC) Supplement to the New Jersey Family Health Survey on 444 children enrolled in NJFC and 145 children disenrolled from NJFC but covered by other insurance at the time of the survey. The CSHCN Screener was used to identify CSHCN. CSHCN in NJFC had 1.5 times the odds of an unmet need for health care; 2.7 times the odds of a cost burden; and 2.2 times the odds of any coverage or service inadequacy than those without SHCN, even when demographic factors and NJFC plan level (which is based on income) were taken into account. CSHCN enrolled in NJFC have more difficulties in some areas of access to care and cost burden. Patterns of access to care, cost burden, and patient/provider communication were similar for children formerly in NJFC who had other types of insurance at the time of the survey. Future studies should use comprehensive measures of adequacy of coverage, including attitudinal, structural and economic perspectives.

Parental eligibility and enrollment in state children's health insurance program: the roles of parental health, employment, and family structure.

We examined eligibility and enrollment among parents of children in New Jersey's State Children's Health Insurance Program following expansion of parental eligibility for NJ FamilyCare coverage. Data were from the 2003 NJ FamilyCare Family Health Survey (n = 416 families). Parental eligibility was higher in households without a full-time employed parent (odds ratio [OR] = 5.50; 95% confidence interval [CI] = 2.72, 11.14) and lower among single parents (OR = 0.38; 95% CI = 0.23, 0.61). Enrollment was higher among single parents (OR = 2.24; 95% CI = 1.17, 4.31). Roughly one third of eligible parents did not enroll, suggesting the need to increase awareness of parental eligibility and reduce barriers to enrollment.

"Quicker and sicker" under Medicare's prospective payment system for hospitals: new evidence on an old issue from a national longitudinal survey.

Medicare's prospective payment system for hospitals (PPS), introduced in the USA in 1983, replaced cost reimbursement with a system of fixed rates which created incentives for hospitals to control costs. Previous studies found that elderly patients were discharged from hospital "quicker and sicker" under PPS and concluded that families were coping at home. We analyse a national longitudinal survey, the first National Health and Nutrition Examination Survey and its Epidemiologic Followup Study, which includes data on more outcomes over a longer period than earlier studies. We find that the rate of admission to nursing homes from the community in the first weeks after a hospital discharge more than tripled under PPS, suggesting that families were not always able to cope. As another response to sicker patients, discharges directly to nursing homes from hospitals, which jumped initially under PPS, may have risen further when payment rates were tightened in the early 1990s. Hospital readmissions fell after the first few years. Our findings are strengthened by the fact that we control for patients' health using health information collected independently of hospital admission.

Is there differential retention of children with special health care needs in the State Children's Health Insurance Program?

OBJECTIVE: The purpose of this work was to determine whether children with special health care needs in New Jersey's State Children's Health Insurance Program are less likely to become uninsured than children without special health care needs. PATIENTS AND METHODS: We used the 2003 New Jersey FamilyCare Supplement to the New Jersey Family Health Survey. Children were randomly selected from the universe of children enrolled in New Jersey FamilyCare as of May 2002, and their families were surveyed during 2003 (N = 675). The Children With Special Health Care Needs Screener was used to identify 5 types of special health care needs. We estimated multinomial logistic regression models of final enrollment status according to the presence of > or = 1 special health care need, controlling for demographic characteristics. RESULTS: Roughly 1 of every 5 children in New Jersey FamilyCare had > or = 1 special health care need. Older children and boys had greater odds of having special health care needs than others. Children with special health care needs had only one fourth the odds of becoming disenrolled and uninsured compared with children without special health care needs, even when controlling for age, gender, race/ethnicity, and insurance plan level. There was no difference in likelihood of finding other health insurance according to children with special health care needs status. CONCLUSIONS: Children with special health care needs were more likely than children without such needs to be covered by health insurance at the time of the survey, either by retaining State Children's Health Insurance Program coverage or by finding other insurance. The higher retention of children with special health care needs in New Jersey FamilyCare is good news for families of these children and their advocates. However, higher health care costs for these children should be considered in federal and state budget planning for the State Children's Health Insurance Program.

Efficacy of pyrethroid-treated nets against malaria vectors and nuisance-biting mosquitoes in Tanzania in areas with long-term insecticide-treated net use.

OBJECTIVE: To measure pyrethroid susceptibility in populations of malaria vectors and nuisance-biting mosquitoes in Tanzania and to test the biological efficacy of current insecticide formulations used for net treatment. METHODS: Anopheles gambiae Giles s.l., An. funestus Giles s.l. and Culex quinquefasciatus Say were collected during three national surveys and two insecticide-treated net (ITN) studies in Tanzania. Knockdown effect and mortality were measured in standard WHO susceptibility tests and ball-frame bio-efficacy tests. Test results from 1999 to 2004 were compared to determine trends in resistance development. RESULTS: Anopheles gambiae s.l. and An. funestus s.l. were highly susceptible to permethrin (range 87-100%) and deltamethrin (consistently 100%) in WHO tests in 1999 and 2004, while Culex quinquefasciatus susceptibility to these pyrethroids was much lower (range 7-100% and 0-84% respectively). Efficacy of pyrethroid-treated nets was similarly high against An. gambiae s.l. and An. funestus s.l. (range 82-100%) while efficacy against Cx. quinquefasciatus was considerably lower (range 2-100%). There was no indication of development of resistance in populations of An. gambiae s.l. or An. funestus s.l. where ITNs have been extensively used; however, susceptibility of nuisance-biting Cx. quinquefasciatus mosquitoes declined in some areas between 1999 and 2004. CONCLUSION: The sustained pyrethroid susceptibility of malaria vectors in Tanzania is encouraging for successful malaria control with ITNs. Continued monitoring is essential to ensure early resistance detection, particularly in areas with heavy agricultural or public health use of insecticides where resistance is likely to develop. Widespread low susceptibility of nuisance-biting Culex mosquitoes to ITNs raises concern for user acceptance of nets.

Preparing and presenting effective research posters.

OBJECTIVES: Posters are a common way to present results of a statistical analysis, program evaluation, or other project at professional conferences. Often, researchers fail to recognize the unique nature of the format, which is a hybrid of a published paper and an oral presentation. This methods note demonstrates how to design research posters to convey study objectives, methods, findings, and implications effectively to varied professional audiences. METHODS: A review of existing literature on research communication and poster design is used to identify and demonstrate important considerations for poster content and layout. Guidelines on how to write about statistical methods, results, and statistical significance are illustrated with samples of ineffective writing annotated to point out weaknesses, accompanied by concrete examples and explanations of improved presentation. A comparison of the content and format of papers, speeches, and posters is also provided. FINDINGS: Each component of a research poster about a quantitative analysis should be adapted to the audience and format, with complex statistical results translated into simplified charts, tables, and bulleted text to convey findings as part of a clear, focused story line. CONCLUSIONS: Effective research posters should be designed around two or three key findings with accompanying handouts and narrative description to supply additional technical detail and encourage dialog with poster viewers.

Lifestyle-related risk factors and risk of future nursing home admission.

BACKGROUND: While risks of disease, hospitalization, and death attributable to lifestyle-related factors such as smoking, inactivity, and obesity have been well studied, their associations with nursing home admission are less well known. These risk factors are usually established by middle age, but nothing is known about how they relate to long-term risk of nursing home admission in this age group. METHODS: Cox proportional hazards regressions were used to analyze risk of nursing home admission over 2 decades of follow-up (1971-1975 to 1992) in a nationally representative, longitudinal survey of community-dwelling adults aged 45 to 74 years at baseline. Middle-aged (45-64 years at baseline) and elderly persons (aged 65-74 years at baseline) were analyzed separately: 230 (6.5%) of 3526 middle-aged respondents and 728 (24.7%) of 2936 elderly ones had 1 or more nursing home admissions. Baseline risk factors included smoking, inactivity, obesity, elevated blood pressure, elevated total cholesterol level, and diabetes mellitus, which were defined according to national guidelines. RESULTS: All lifestyle-related factors, except total cholesterol level, were associated with higher risk of nursing home admission during follow-up in one or both age groups. Risk ratios were higher in middle-aged than in elderly persons. In those aged 45 to 64 years at baseline, diabetes more than tripled the risk of nursing home admission (relative risk, 3.25; 95% confidence interval, 2.04-5.19); smoking, inactivity, and elevated systolic blood pressure had relative risks of 1.56, 1.40, and 1.35, respectively. Obesity was a risk factor for those aged 65 to 74 years at baseline, but not for the middle-aged subjects. Persons with 2 lifestyle-related factors were at greatly increased risk, especially if 1 was diabetes. CONCLUSIONS: Lifestyle factors are important contributors to the long-term risk of nursing home admission. Modifying lifestyle, especially in middle age, may reduce the risk of admission.