Did COVID-19 ICU patient mortality risk increase as Colorado hospitals filled? A retrospective cohort study.

OBJECTIVES: To assess whether increasing levels of hospital stress-measured by intensive care unit (ICU) bed occupancy (primary), ventilators in use and emergency department (ED) overflow-were associated with decreasing COVID-19 ICU patient survival in Colorado ICUs during the pre-Delta, Delta and Omicron variant eras. DESIGN: A retrospective cohort study using discrete-time survival models, fit with generalised estimating equations. SETTING: 34 hospital systems in Colorado, USA, with the highest patient volume ICUs during the COVID-19 pandemic. PARTICIPANTS: 9196 non-paediatric SARS-CoV-2 patients in Colorado hospitals admitted once to an ICU between 1 August 2020 and 1 March 2022 and followed for 28 days. OUTCOME MEASURES: Death or discharge to hospice. RESULTS: For Delta-era COVID-19 ICU patients in Colorado, the odds of death were estimated to be 26% greater for patients exposed every day of their ICU admission to a facility experiencing its all-era 75th percentile ICU fullness or above, versus patients exposed for none of their days (OR: 1.26; 95% CI: 1.04 to 1.54; p=0.0102), adjusting for age, sex, length of ICU stay, vaccination status and hospital quality rating. For both Delta-era and Omicron-era patients, we also detected significantly increased mortality hazard associated with high ventilator utilisation rates and (in a subset of facilities) states of ED overflow. For pre-Delta-era patients, we estimated relatively null or even protective effects for the same fullness exposures, something which provides a meaningful contrast to previous studies that found increased hazards but were limited to pre-Delta study windows. CONCLUSIONS: Overall, and especially during the Delta era (when most Colorado facilities were at their fullest), increasing exposure to a fuller hospital was associated with an increasing mortality hazard for COVID-19 ICU patients.

Notes from the Field: Potential Outbreak of Extrapulmonary Mycobacterium abscessus subspecies massiliense Infections from Stem Cell Treatment Clinics in Mexico - Arizona and Colorado, 2022.

Mycobacterium abscessus is an intrinsically drug-resistant, rapidly growing, nontuberculous mycobacterium; extrapulmonary infections have been reported in association with medical tourism (1). During November-December 2022, two Colorado hospitals (hospitals A and B) treated patient A, a Colorado woman aged 30-39 years, for M. abscessus meningitis. In October 2022, she had received intrathecal donor embryonic stem cell injections in Baja California, Mexico to treat multiple sclerosis and subsequently experienced headaches and fevers, consistent with meningitis. Her cerebrospinal fluid revealed neutrophilic pleocytosis and grew M. abscessus in culture at hospital A. Hospital A's physicians consulted hospital B's infectious diseases (ID) physicians to co-manage this patient (2).

Acute Gastroenteritis Outbreak Among Colorado River Rafters and Backpackers in the Grand Canyon, 2022.

INTRODUCTION: From April 1 to May 31, 2022, Grand Canyon National Park received increased acute gastroenteritis reports. Pooled portable toilet specimens identified norovirus genogroups I and II. We sought to determine outbreak transmission contributors and individual risk factors while rafting or backpacking in the park. METHODS: Grand Canyon rafters and backpackers were surveyed online from June 13-July 8, 2022, and a Cox proportional hazards model was used to identify predictors associated with illness and adjusted for potential confounding factors. RESULTS: Among 762 surveys, 119 cases and 505 well persons submitted complete survey data. Illness among rafters was associated with interaction with ill persons during the trip (adjusted hazard ratio [adjHR] = 3.4 [95%CI 2.3-5.0]) and lack of any hand hygiene (1.2 [0.7-1.9]) or use of only sanitizer or water (1.6 [1.04-2.6]) before snacks. Younger rafters had higher illness rates compared to those ≥60 y (1.5 [1.2-1.8] for ages 40-59 and 2.2 [1.4-3.5] for ages <40 y). CONCLUSIONS: Person-to-person transmission likely accounted for the widespread outbreak. Future outbreak mitigation efforts on river trips could focus on symptom screening before the trip starts, prompt separation of ill and well passengers, strict adherence to hand hygiene with soap and water, minimizing social interactions among rafting groups, and widespread outbreak notices and education to all park users.

Involuntary displacement and self-reported health in a cross-sectional survey of people experiencing homelessness in Denver, Colorado, 2018-2019.

BACKGROUND: The number of people experiencing unsheltered homelessness in the U.S. is increasing. Municipalities have responded with punitive responses such as involuntary displacement (i.e., encampment sweeps, move along orders), but little is known about the impact of involuntary displacement on health. The purpose of this study was to investigate the association between broadly defined experiences of involuntary displacement and self-reported health conditions among people experiencing homelessness. METHODS: We used logistic regression models to generate odds ratios using publicly available data from a cross-sectional sample of people experiencing homelessness in Denver, Colorado, during September 2018-February 2019. Hosmer-Lemeshow Goodness of Fit tests were used to assess model fit. RESULTS: Among 397 people experiencing homelessness, involuntary displacement was significantly associated with self-reported infectious diseases (adjusted odds ratio (aOR) 2.09, 95% CI 1.27, 3.41), substance and alcohol use (aOR 2.83; 95% CI 1.70, 4.73), climate-related conditions (aOR 2.27; 95% CI 1.35, 3.83), and worsening mental health (aOR 2.00; 95% CI 1.24, 3.24) after controlling for potential confounders. No statistically significant associations were identified between involuntary displacement and injuries, musculoskeletal issues, chronic conditions, and chronic mental and emotional issues. CONCLUSIONS: This research quantifies the association between involuntary displacement and multiple infectious and non-infectious health outcomes. While city officials attempt to grapple with increasing unsheltered homelessness, it is important to understand what harms are occurring that are associated with current policies. Our research adds to the growing body of literature that involuntary displacement is a harmful response to unsheltered homelessness. Alternative approaches focused on connections to housing and social services should be prioritized.

Legislative Health Notes: Preliminary Learnings From Piloting a New Policy Analysis Tool.

CONTEXT: In 2018, the Health Impact Project (the Project) developed and tested a new health in all policies (HiAP) tool called "legislative health notes" to provide state and local legislators with peer-reviewed evidence, public health data, and local data that illustrate potential positive and negative health and equity effects of proposed bills. OBJECTIVES: The Project sought to refine the health note methodology while piloting the tool in the Colorado and Indiana General Assemblies, and with the Council of the District of Columbia, and worked with affiliates to introduce them in North Carolina, Ohio, and California. DESIGN AND PARTICIPANTS: External partners solicited feedback on health notes via semistructured interviews and surveys from legislators, legislative staff, and expert reviewers who were familiar with health notes in each of these jurisdictions. RESULTS: Respondents shared that health notes were nonpartisan, were easy for nonexperts to understand, and would be more effective if delivered earlier in the legislative process. CONCLUSION: In response to informant feedback, practitioners can explore adding high-level summaries, increasing focus on health equity implications and the potential to work with legislators during the policy formulation phase. Data from this pilot suggest that legislative health notes are a promising nonpartisan and standardized tool to better understand the health and equity implications of proposed legislation.

Extended Postpartum Medicaid In Colorado Associated With Increased Treatment For Perinatal Mood And Anxiety Disorders.

Perinatal mood and anxiety disorders (PMAD), a leading cause of perinatal morbidity and mortality, affect approximately one in seven births in the US. To understand whether extending pregnancy-related Medicaid eligibility from sixty days to twelve months may increase the use of mental health care among low-income postpartum people, we measured the effect of retaining Medicaid as a low-income adult on mental health treatment in the postpartum year, using a "fuzzy" regression discontinuity design and linked all-payer claims data, birth records, and income data from Colorado from the period 2014-19. Relative to enrolling in commercial insurance, retaining postpartum Medicaid enrollment was associated with a 20.5-percentage-point increase in any use of prescription medication or outpatient mental health treatment, a 16.0-percentage-point increase in any use of prescription medication only, and a 7.3-percentage-point increase in any use of outpatient mental health treatment only. Retaining postpartum Medicaid enrollment was also associated with $40.84 lower out-of-pocket spending per outpatient mental health care visit and $3.24 lower spending per prescription medication for anxiety or depression compared with switching to commercial insurance. Findings suggest that extending postpartum Medicaid eligibility may be associated with higher levels of PMAD treatment among the low-income postpartum population.

Petitions for Extreme Risk Protection Orders and Second Amendment Sanctuary Status in Colorado.

Importance: Extreme risk protection orders (ERPOs) temporarily bar individuals adjudicated as being at risk of violence (including suicide) from buying or possessing firearms. In protest, many US jurisdictions have declared themselves "Second Amendment sanctuaries" (2A sanctuaries). Many 2A sanctuaries continue to use ERPOs in low numbers, suggesting a poorly defined risk threshold at which they are acceptable. Objective: To characterize circumstances under which ERPOs are used in 2A sanctuaries, highlighting their most broadly acceptable applications. Design, Setting, and Participants: This cross-sectional study of civil court documents analyzed petitions for ERPOs filed in Colorado from January 2020 to December 2022. All petitions during the study period were included following de-duplication. These include petitions filed by law enforcement and family members against adults allegedly at risk of firearm violence across the state. Data were analyzed on a rolling basis between January 2020 and June 2023. Exposure: ERPO petition filed in Colorado. Main Outcomes and Measures: Seventy-seven data elements defined a priori were abstracted from all petitions and case files, including respondent demographics, petitioner types (family or law enforcement), types of threats (self, other, mass violence, combination), violence risk factors, and case outcomes (granted, denied). Results: Of a total 338 ERPOs filed in Colorado, 126 (37.3%) occurred in 2A sanctuaries. Sixty-one of these 2A petitions were granted emergency orders, and 40 were full 1-year ERPOs after a hearing. Forty ERPOs (31.7%) were petitioned for by law enforcement. Petitions in non-2A counties were more likely to have been filed by law enforcement (138 of 227 [64.9%] vs 40 of 126 [31.7%]; P < .001) and to have had an emergency order granted (177 of 227 [78.0%] vs 61 of 126 [48.4%]; P < .001) than in 2A sanctuaries. Qualitative analysis of cases in 2A sanctuaries revealed common aggravating risk characteristics, including respondents experiencing hallucinations, histories of police interaction, and substance misuse. ERPOs have been granted in 2A sanctuaries against individuals threatening all forms of violence we abstracted for (themselves, others, and mass violence). Conclusions and Relevance: In this examination of ERPO petitions across Colorado, more than a third of filings occurred in 2A sanctuaries. Nonetheless, law enforcement represent proportionately fewer petitions in these areas, and petitions are less likely to be granted. Serious mental illness, substance misuse, and prior interactions with law enforcement featured prominently in 2A sanctuary petitions. These case circumstances highlight dangerous situations in which ERPOs are an acceptable risk-prevention tool, even in areas politically predisposed to opposing them.

Lessons Learned from Cross-Systems Approach to COVID-19 Pandemic Response in Juvenile Justice System, Colorado, USA.

The global COVID-19 pandemic illustrates the importance of a close partnership between public health and juvenile justice systems when responding to communicable diseases. Many setting-specific obstacles must be navigated to respond effectively to limit disease transmission and negative health outcomes while maintaining necessary services for youth in confinement facilities. The response requires multidisciplinary expertise and collaboration to address unique considerations. Public health mitigation strategies must balance the risk for disease against the negative effects of restrictions. Key aspects of the COVID-19 response in the juvenile justice system of Colorado, USA, involved establishing robust communication and data reporting infrastructures, building a multidisciplinary response team, adapting existing infection prevention guidelines, and focusing on a whole-person health approach to infection prevention. We examine lessons learned and offer recommendations on pandemic emergency response planning and managing a statewide public health emergency in youth confinement settings that ensure ongoing readiness.

The 23rd Annual Meeting of the Rocky Mountain Virology Association.

Located 50 miles west of Fort Collins, Colorado, Colorado State University's Mountain Campus in Pingree Park hosted the 23rd annual Rocky Mountain Virology Association meeting in 2023 with 116 participants. The 3-day event at the end of September consisted of 28 talks and 43 posters that covered the topics of viral evolution and surveillance, developments in prion research, arboviruses and vector biology, host-virus interactions, and viral immunity and vaccines. This year's Randall Jay Cohrs keynote presentation covered the topic of One Health and emerging coronaviruses. This timely discussion covered the importance of global disease surveillance, international collaboration, and trans-disciplinary research teams to prevent and control future pandemics. Peak fall colors flanked the campus and glowed along the multiple mountain peaks, allowing for pristine views while discussing science and networking, or engaging in mountain activities like fly fishing and hiking. On behalf of the Rocky Mountain Virology Association, this report summarizes select presentations from the 23rd annual meeting.

An examination of early socioeconomic status and neighborhood disadvantage as independent predictors of antisocial behavior: A longitudinal adoption study.

The present study examined early socioeconomic status (SES) and neighborhood disadvantage (ND) as independent predictors of antisocial behavior (ASB) and addressed the etiology of the associations (i.e., genes versus the environment) using a longitudinal adoption design. Prospective data from the Colorado Adoption Project (435 adoptees, 598 nonadopted children, 526 biological grandparents of adoptees, 481 adoptive parents, and 617 nonadoptive parents including biological parents of unrelated siblings of adoptees) were examined. SES and ND were assessed during infancy and ASB was evaluated from ages four through 16 using parent and teacher report. Associations between predictors and ASB were compared across adoptive and nonadoptive families and sex. Early SES was a nominally significant, independent predictor of antisocial ASB, such that lower SES predicted higher levels of ASB in nonadoptive families only. ND was not associated with ASB. Associations were consistent across aggression and delinquency, and neither SES nor ND was associated with change in ASB over time. Nominally significant associations did not remain significant after controlling for multiple testing. As such, despite nonsignificant differences in associations across sex or adoptive status, we were unable to make definitive conclusions regarding the genetic versus environmental etiology of or sex differences in the influence of SES and ND on ASB. Despite inconclusive findings, in nonadoptees, results were consistent-in effect size and direction-with previous studies in the literature indicating that lower SES is associated with increased risk for ASB.

Temperature-driven homogenization of an ant community over 60 years in a montane ecosystem.

Identifying the mechanisms underlying the changes in the distribution of species is critical to accurately predict how species have responded and will respond to climate change. Here, we take advantage of a late-1950s study on ant assemblages in a canyon near Boulder, Colorado, USA, to understand how and why species distributions have changed over a 60-year period. Community composition changed over 60 years with increasing compositional similarity among ant assemblages. Community composition differed significantly between the periods, with aspect and tree cover influencing composition. Species that foraged in broader temperature ranges became more widespread over the 60-year period. Our work highlights that shifts in community composition and biotic homogenization can occur even in undisturbed areas without strong habitat degradation. We also show the power of pairing historical and contemporary data and encourage more mechanistic studies to predict species changes under climate change.

Evaluation of per- and polyfluoroalkyl substances (PFAS) in landfill liquids from Pennsylvania, Colorado, and Wisconsin.

PER: and polyfluoroalkyl substances (PFAS) have been measured in aqueous components within landfills. To date, the majority of these studies have been conducted in Florida. This current study aimed to evaluate PFAS concentrations in aqueous components (leachate, gas condensate, stormwater, and groundwater) from four landfills located outside of Florida, in Pennsylvania, Colorado, and Wisconsin (2 landfills). The Pennsylvania landfill also provided the opportunity to assess a leachate treatment system. Sample analyses were consistent across studies including the measurements of 26 PFAS and physical-chemical parameters. For the four target landfills, average PFAS concentrations were 6,900, 22,000, 280, and 260 ng L-1 in the leachate, gas condensate, stormwater, and groundwater, respectively. These results were not significantly different than those observed for landfills in Florida except for the significantly higher PFAS concentrations in gas condensate compared to leachate. For on-site treatment at the Pennsylvania landfill, results suggest that the membrane biological bioreactor (MBBR) system performed similarly as aeration-based leachate treatment systems at Florida landfills resulting in no significant decreases in ∑26PFAS. Overall, results suggest a general consistency across US regions in PFAS concentrations within different landfill liquid types, with the few differences observed likely influenced by landfill design and local climate. Results confirm that leachate exposed to open air (e.g., in trenches or in treatment systems) have lower proportions of perfluoroalkyl acid precursors relative to leachate collected in enclosed pipe systems. Results also confirm that landfills without bottom liner systems may have relatively higher PFAS levels in adjacent groundwater and that landfills in wetter climates tend to have higher PFAS concentrations in leachate.

Population genomics of flat-tailed horned lizards (Phrynosoma mcallii) informs conservation and management across a fragmented Colorado Desert landscape.

Phrynosoma mcallii (flat-tailed horned lizards) is a species of conservation concern in the Colorado Desert of the United States and Mexico. We analysed ddRADseq data from 45 lizards to estimate population structure, infer phylogeny, identify migration barriers, map genetic diversity hotspots, and model demography. We identified the Colorado River as the main geographic feature contributing to population structure, with the populations west of this barrier further subdivided by the Salton Sea. Phylogenetic analysis confirms that northwestern populations are nested within southeastern populations. The best-fit demographic model indicates Pleistocene divergence across the Colorado River, with significant bidirectional gene flow, and a severe Holocene population bottleneck. These patterns suggest that management strategies should focus on maintaining genetic diversity on both sides of the Colorado River and the Salton Sea. We recommend additional lands in the United States and Mexico that should be considered for similar conservation goals as those in the Rangewide Management Strategy. We also recommend periodic rangewide genomic sampling to monitor ongoing attrition of diversity, hybridization, and changing structure due to habitat fragmentation, climate change, and other long-term impacts.

Changes in contraceptive method mix following the Colorado Family Planning Initiative.

OBJECTIVES: To describe the changes in contraceptive method use and mix among Colorado Title X clients following the 2009 Colorado Family Planning Initiative (CFPI), which allowed Colorado Title X providers to offer all contraceptive methods without medically unnecessary barriers. STUDY DESIGN: Using data on all visits to Colorado Title X clinics between 2007 and 2016 for women aged 10-49 years, we described trends in contraceptive method use by age group and race/ethnicity prior to and following the implementation of CFPI. RESULTS: The implementation of CFPI saw an abrupt increase in Title X visits. Visits subsequently declined steeply for non-Hispanic White clients while visits by Hispanic clients remained at elevated levels. During CFPI, the use of long-acting reversible contraceptives increased while the use of oral contraceptive pills decreased. Nonetheless, oral contraceptive pills remained the most common method used by Title X clients throughout the study period. Changes in the method mix varied by age and race/ethnicity. Method switching was relatively uncommon among established Title X clinic users. CONCLUSIONS: CFPI, which removed financial barriers to the most expensive methods, was associated with increases in the use of long-acting reversible contraceptives and changes in method mix that varied by age group and race/ethnicity. IMPLICATIONS: CFPI removed barriers to previously inaccessible methods that contributed to changes in the method mix at Title X clinics. That these changes were not uniform across ages and race/ethnicities emphasize that subgroup variation in family planning policy impact stems from heterogeneity in barriers to care and method-specific unmet demand.

Critical incidents in Colorado's opioid treatment programs: A comparison of the COVID-19 pandemic to previous years.

INTRODUCTION: In response to the COVID-19 pandemic, Substance Abuse and Mental Health Services Administration (SAMHSA) guidance allowed opioid treatment programs (OTPs) greater flexibility to provide take-home medication doses to patients. This study aims to characterize trends in the rates of critical incidents-safety events occurring in OTPs that are reportable to regulatory entities-across all Colorado OTPs during the COVID-19 pandemic. METHODS: This study is a retrospective review of critical incidents (CIs) for patients enrolled in Colorado OTPs between the years 2017 to 2022, as recorded in Colorado Behavioral Health Administration's (BHA) Opioid Treatment Program Critical Incident Repository Dataset. March 15, 2020 was considered the start of the COVID-19 pandemic in Colorado, so only incidents which occurred from March 15-December 31 of each year were included. CI rate per 100 patients was calculated by dividing CI annual count between March 15-December 31 by the census of enrolled patients at the calendar midpoint of this period, which is August 7. Means comparison tests assessed differences in CI rates. RESULTS: OTP patient enrollment in Colorado increased from 4377 in 2017 to 7327 in 2022. Overall, Medication Diversion accounted for 70 % of CIs, followed by Death (14 %), and Other (5 %). There was a significant increase in the overall rate of CIs from 2017 to 2022 (1.1 % to 3.4 %). The average post-COVID CI rate was higher than pre-COVID (4.0 % vs. 2.4 %). There was no difference, however, in the post-COVID rate of CIs when exclusively compared to 2019 (4.0 % vs. 4.1 %). Post-pandemic years had significantly more CIs per month than pre-pandemic years (27.6 ± 5.6 vs 15.8 ± 3.5). There was no difference in mean monthly CIs between 2019 and post-pandemic (28.5 ± 5.3 vs 27.6 ± 5.6). CONCLUSIONS: There was no increase in the rate of reportable CIs in Colorado OTPs following the SAMHSA COVID-19 guidance increasing take-home doses when comparing 2019 to post-pandemic years. The notable increase in CI incidence occurred from 2018 to 2019, predating the pandemic. These data offer a measure of reassurance for the safety of increased take-home methadone doses. There should be further consideration of how a greater number of take-home doses might benefit both patients and OTPs.

Identification of Social Determinants of Education Among Pharmacy Students: Results From a Single-Institution Survey.

OBJECTIVE: To identify social determinants of education (SDOE) among pharmacy students enrolled in the entry-level Doctor of Pharmacy program at the University of Colorado Skaggs School of Pharmacy and Pharmaceutical Sciences. METHODS: An original 28-item survey was developed and disseminated to first through fourth year students enrolled in the entry-level Doctor of Pharmacy program at the University of Colorado Skaggs School of Pharmacy and Pharmaceutical Sciences during the spring 2023 semester. The survey evaluated student demographics, educational performance, and SDOE in 6 categories: physical health, psychosocial health, economic stability, self-motivation, social environment/community, and physical environment/community. RESULTS: A total of 133 students responded to the survey. Over half of the respondents acknowledged difficulties completing errands or self-care tasks owing to their physical, mental, or emotional health. Over half of respondents also reported concerns about covering expenses at the end of the month. Respondents also reported eating less because of financial restraints (20.0%), worrying about housing (22.9%), feeling unsafe in their neighborhood (29.0%), and feeling lonely or isolated (63.4%). In the secondary analysis, the respondents who had concerns with covering expenses, affording food, or losing housing had significantly lower academic performance. CONCLUSION: This study identified several SDOE among pharmacy students at our institution, suggesting that students at even the highest levels of education may be subject to disparities. The identification of SDOE provides insight into barriers that are potentially hidden but are highly likely to impact student engagement and success. Efforts toward reducing disparities and promoting equitable opportunities for students are necessary to ensure continued growth and diversification of the pharmacy profession.

Provider-Reported Barriers in Sexual Health Care Services for Women With Upstream Barriers: The Case of Syphilis and Congenital Syphilis in Southern Colorado, 2022.

BACKGROUND: Syphilis and congenital syphilis rates have increased sharply in Colorado in the past 5 years. Congenital syphilis is passed during pregnancy in utero and can cause lifelong physical, developmental, and neurologic problems for the child, or can lead to miscarriage, stillbirth, or early infant death. Congenital syphilis is easily prevented if the mother receives timely testing, treatment, and prenatal care. Providers can play a key role in preventing congenital syphilis for women with social vulnerabilities, who have a higher likelihood of syphilis and/or congenital syphilis infection. METHODS: We surveyed 23 and interviewed 4 health care providers in southern Colorado in 2022 to record their experiences in providing sexual health care services. We asked providers with direct care experience about perceived barriers in effectively treating syphilis. RESULTS: The most significant barriers reported in the survey were the cost of treatment (26%) and the loss to follow-up (22%). Interviews revealed further challenges, including discretionary testing procedures, delays in screening results, treatment referral issues, and stigma around substance use and sexual activity. CONCLUSIONS: Elevated syphilis and congenital syphilis rates pose significant public health challenges. Coordinated interventions are necessary to effectively reduce the transmission of syphilis and congenital syphilis among women with upstream barriers. Potential care solutions include expanding rapid, point-of care testing and treatment options, supporting bicillin delivery or web-based inventory systems, offering anti-stigma training for providers, offering mental and behavioral health resources at providers' clinics, and expanding partnerships with syringe access programs.

Evaluating the sensitivity of mortality attributable to pollution to modeling Choices: A case study for Colorado.

We evaluated the sensitivity of estimated PM2.5 and NO2 health impacts to varying key input parameters and assumptions including: 1) the spatial scale at which impacts are estimated, 2) using either a single concentration-response function (CRF) or using racial/ethnic group specific CRFs from the same epidemiologic study, 3) assigning exposure to residents based on home, instead of home and work locations for the state of Colorado. We found that the spatial scale of the analysis influences the magnitude of NO2, but not PM2.5, attributable deaths. Using county-level predictions instead of 1 km2 predictions of NO2 resulted in a lower estimate of mortality attributable to NO2 by âˆ¼ 50 % for all of Colorado for each year between 2000 and 2020. Using an all-population CRF instead of racial/ethnic group specific CRFs results in a 130 % higher estimate of annual mortality attributable for the white population and a 40 % and 80 % lower estimate of mortality attributable to PM2.5 for Black and Hispanic residents, respectively. Using racial/ethnic group specific CRFs did not result in a different estimation of NO2 attributable mortality for white residents, but led to âˆ¼ 50 % lower estimates of mortality for Black residents, and 290 % lower estimate for Hispanic residents. Using NO2 based on home instead of home and workplace locations results in a smaller estimate of annual mortality attributable to NO2 for all of Colorado by 2 % each year and 0.3 % for PM2.5. Our results should be interpreted as an exercise to make methodological recommendations for future health impact assessments of pollution.

A temporal evaluation of respirable crystalline silica exposure for construction tasks.

Personal air monitoring using a TSI SidePak AM520 personal aerosol monitor was performed on a northern Colorado construction site during five tasks from the OSHA Table 1: Specified Exposure Control Methods When Working With Materials Containing Crystalline Silica to estimate silica dust concentrations in real time. Photometric measurements were modified using a gravimetric correction factor and a % respirable crystalline silica adjustment. Each task was sampled once; sample time ranged from 14 min to 40 min, with a mean sample time of 27 min. The mean silica dust concentration estimates (µg/m3) (standard deviation [SD]) for the five tasks computed from the TSI SidePak AM520 respirable dust measurements were core drilling 12 µg/m3 [2.46], grinding 918 µg/m3 [1134.08], cutting with a walk-behind saw 36 µg/m3 [79.67], jackhammering 27 µg/m3 [23.24], and dowel drilling 66 µg/m3 [77.65]. Silica exposure estimates from real-time monitoring can be used to identify exposures that may be related to inadequate controls or worker behaviors that contribute to peak exposures. Respirable crystalline silica exposure estimates presented here are likely not generalizable to other construction sites or tasks.