Impacts of abstinence education on teen sexual activity, risk of pregnancy, and risk of sexually transmitted diseases.

This paper examines the impacts of four abstinence-only education programs on adolescent sexual activity and risks of pregnancy and sexually transmitted diseases (STDs). Based on an experimental design, the impact analysis uses survey data collected in 2005 and early 2006 from more than 2,000 teens who had been randomly assigned to either a program group that was eligible to participate in one of the four programs or a control group that was not. The findings show no significant impact on teen sexual activity, no differences in rates of unprotected sex, and some impacts on knowledge of STDs and perceived effectiveness of condoms and birth control pills

The truncation-by-death problem: what to do in an experimental evaluation when the outcome is not always defined.

Although experiments are viewed as the gold standard for evaluation, some of their benefits may be lost when, as is common, outcomes are not defined for some sample members. In evaluations of marriage interventions, for example, a key outcome--relationship quality--is undefined when a couple splits up. This article shows how treatment-control differences in mean outcomes can be misleading when outcomes are not defined for everyone and discusses ways to identify the seriousness of the problem. Potential solutions to the problem are described, including approaches that rely on simple treatment-control differences-in-means as well as more complex modeling approaches.

Feeding Infants and Toddlers Study (FITS): development of the FITS survey in comparison to other dietary survey methods.

OBJECTIVE: This article describes the steps in the planning and development of the 2002 Feeding Infants and Toddlers Study. METHODS: We describe the study's rationale, sampling methodology, survey questionnaire development, dietary methodology, field data collection, and data processing and analysis. A brief review of existing national nutrition surveys and studies of infants and toddlers, and available study designs and dietary methods, is also included. SUBJECTS/SETTING: Most national studies have been cross-sectional and assessed breastfeeding rates, dietary intake, and nutritional status among general and high-risk populations. Other specialized studies have been longitudinal and tracked dietary intake and nutritional status from infancy to the preschool years, or focused on studying a specific research topic, such as the relationship between fluoride intake and dental caries. CONCLUSIONS: The 2002 Feeding Infants and Toddlers Study has advanced the knowledge base on infant and toddler nutrition by using state-of-the-art methodology and by providing researchers with updated information to develop further research questions. Our findings can be used by child health and nutrition organizations to develop dietary recommendations and improved nutrition education materials. Clinicians and practitioners in the fields of public health and wellness can use the information to provide practical advice to parents in a variety of settings to help give children a more healthful start.

Relationship between portion size and energy intake among infants and toddlers: evidence of self-regulation.

OBJECTIVES: To assess whether dietary intakes of infants and young toddlers show evidence of energy self-regulation. DESIGN: Data from 24-hour recalls collected in the 2002 Feeding Infants and Toddlers Study were analyzed. Multivariate regressions were used to explore the relationship between portion size and usual energy intake as well as the relationship between portion size, number of eating occasions, number of unique foods, and energy density. SUBJECTS/SETTING: A national random sample of 3,022 US infants and toddlers 4 to 24 months of age. STATISTICAL ANALYSES PERFORMED: To measure variability in portion size, an average portion size z score was computed for each child in the sample, across 45 different food groups. The number of eating occasions was defined as the total number of times a child had anything to eat or drink during the day, excluding eating occasions that included only water and/or supplements. The total number of unique foods in a day was defined as the number of unique food codes included in the 24-hour recall, and energy density was computed as kilocalories/gram, including all foods, beverages, and water. Linear regression models were used to assess the effect of portion size and other self-regulation mechanisms on energy intake and to assess the effect of these self-regulation mechanisms on portion size. Separate analyses were performed for three age groups: 4 to 5 months, 6 to 11 months, and 12 to 24 months. RESULTS: A significant negative association was found for all age groups between the number of eating occasions and average portion size z scores, indicating that children who eat less often during the day consume larger-than-average-portion sizes and children who eat more often during the day consume smaller-than-average portions. For infants (11 months and younger), a significant negative association was noted between energy density and average portion size z scores, indicating that, as the energy density of the diet goes down, infants consume larger-than-average portions and, as the energy density of the diet goes up, they consume smaller-than-average portions. Among infants 6 to 11 months, there was a significant positive relationship between portion size and the number of unique foods consumed. For toddlers, there was no association between average portion size z scores and energy density, suggesting that energy self-regulation mechanisms are diminished in this age group. CONCLUSIONS: Our findings confirm the presence of energy self-regulation among infants and young toddlers. These findings can be used to assure parents and caregivers that infants have an innate ability to regulate energy intake. At the same time, it is important to educate parents and caregivers about the potential for environmental cues to diminish natural hunger-driven eating behaviors, even among young toddlers. Dietetics professionals should emphasize the potential adverse effects that coercive feeding behaviors can have on children's innate ability to regulate energy intake. This includes not only admonitions to "clean your plate," but overrestriction of intake that may be motivated by concerns that children are overeating.

Feeding infants and toddlers study: overview of the study design.

OBJECTIVE: Describe the design, data collection procedures, and sample characteristics of the Feeding Infants and Toddlers Study. DESIGN: We conducted up to three telephone interviews with a random sample of parents or caregivers of infants and toddlers four to 24 months of age from March to July 2002. The three interviews included (a) a recruitment and household interview; (b) a 24-hour dietary recall, with supplementary questions on growth, development, and feeding patterns; and (c) a second dietary recall for a random subset of the sample. Two age subgroups of infants (four to six months and nine to 11 months) were over sampled. Sample weights adjusted for over sampling, nonresponse, and under coverage of some subgroups in the sample frame. SUBJECTS: A national random sample of 3,022 infants and toddlers, with two days of dietary recall available for 703 sample members. RESULTS: Of sampled households that could be located and had an eligible child in the study age range, the response rate to the recruitment interview was 73%. Of recruited households, the response rate for the dietary recall interview was 94%. APPLICATIONS/CONCLUSIONS: The Feeding Infants and Toddlers Study (FITS) provides a wealth of data on the food and nutrient intakes, background characteristics, growth and development milestones, and feeding patterns and transitions for a nationally representative sample of infants and toddlers. Subsequent papers in this journal issue present study findings and conclusions from in-depth analysis of the FITS data.

Feeding infants and toddlers study: What foods are infants and toddlers eating?

OBJECTIVE: To describe the food consumption patterns of US infants and toddlers, 4 to 24 months of age. DESIGN: Descriptive analysis of data collected in the 2002 Feeding Infants and Toddlers study based on telephone interviews and 24-hour dietary recalls. SUBJECTS: A national random sample of 3,022 infants and toddlers age 4 to 24 months. STATISTICAL ANALYSES PERFORMED: The percentage of infants and toddlers consuming foods from specific food groups was estimated for six age groups, using a single 24-hour recall. RESULTS: Infants as young as 7 months of age showed food patterns that have been observed in older children and adults. From 18% to 33% of infants and toddlers between ages 7 and 24 months consumed no discrete servings of vegetables, and 23% to 33% consumed no fruits. French fries were one of the three most common vegetables consumed by infants 9 to 11 months of age. By 15 to 18 months, french fries were the most common vegetable. Almost half (46%) of 7- to 8-month-olds consumed some type of dessert, sweet, or sweetened beverage, and this percentage increased as age increased. By 19 to 24 months, 62% of toddlers consumed a baked dessert, 20% consumed candy, and 44% consumed a sweetened beverage. APPLICATIONS: Parents and caregivers should be encouraged to offer a wide variety of vegetables and fruits daily, with emphasis on dark green, leafy, and deep yellow vegetables and colorful fruits. They should offer desserts, sweets, sweetened beverages, and salty snacks only occasionally, offering nutrient-dense, age-appropriate foods as alternatives (eg, fruit, cheese, yogurt, and cereals). Water, milk, and 100% fruit juices should be offered as alternative beverages. Because family food choices influence what foods are offered to children, family-based approaches to developing healthy eating habits may be helpful.

Nutrient intakes of infants and toddlers.

OBJECTIVES: To assess the nutrient adequacy of the diets of US infants and toddlers 4 to 24 months of age. DESIGN: Descriptive analysis of the usual nutrient intakes of infants and toddlers using 24-hour recall data from the 2002 Feeding Infants and Toddlers Study. SUBJECTS: A national random sample of 3,022 infants and toddlers, with 2 days of recall available for 703 sample members. Sample sizes by age were: infants 4 to 6 months (n=862), infants 7 to 11 months (n=1,162), and toddlers 12 to 24 months (n=998). STATISTICAL ANALYSES PERFORMED: Using the personal computer version of the Software for Intake Distribution Estimation, we estimated (where applicable) the percentage of infants and toddlers with usual intakes below the estimated average requirement, compared the means of usual nutrient intake distributions with adequate intake levels, and compared the 99th percentile of usual intake distributions with tolerable upper intake levels. RESULTS: For infants under 12 months of age, mean usual intakes exceeded the adequate intake for all nutrients. For toddlers 12 to 24 months of age, the estimated prevalence of inadequacy was low for most nutrients; however, 58% of toddlers had usual vitamin E intakes less than the estimated average requirement. Mean energy intake exceeded the estimated energy requirement by 10% for infants 4 to 6 months, 23% for infants 7 to 12 months, and 31% for toddlers 12 to 24 months of age. The discrepancy between mean energy intake and the estimated energy requirement for infants 4 to 6 months of age was larger for infants fed solids than for infants consuming only breast milk or formula. Fiber intakes of toddlers were below the adequate intake. APPLICATIONS: Studies should examine whether parents overreport foods consumed by infants and toddlers, and whether infants and toddlers are consuming more energy than required. Additional research is indicated to substantiate some of the new Dietary Reference Intakes for infants and children 1 to 3 years of age.

Feeding infants and toddlers study: Improvements needed in meeting infant feeding recommendations.

OBJECTIVE: To assess adherence to infant feeding recommendations among a sample of infants and toddlers four to 24 months of age in the United States. DESIGN: Descriptive analysis of data collected in the 2002 Feeding Infants and Toddlers Study (FITS) based on telephone interviews and 24-hour dietary recalls collected with the Nutrition Data System for Research of the University of Minnesota. SUBJECTS: A national random sample of 3,022 infants and toddlers age four to 24 months, including 2,024 infants age four to 11 months. MAIN OUTCOME MEASURES: Breastfeeding, timing of introduction of complementary foods, and adherence to infant feeding recommendations. STATISTICAL ANALYSES: Means and standard errors, percentile distributions, and percentages by age group (four to six months, seven to eight months, and nine to 11 months). RESULTS: About 76% of infants and toddlers were fully or partly breastfed at birth. This percentage declined to 30% at six months and 16% at 12 months-short of Healthy People 2010 goals of 50% and 25%, respectively. The average duration of breastfeeding was 5.5 months for all who initiated breastfeeding. About two-thirds of infants had been introduced to complementary foods between four and six months-the period recommended by the American Academy of Pediatrics (AAP); 17% consumed juice before the AAP recommended age of six months or later. Twenty-two percent of infants nine to 11 months consumed cow's milk on a daily basis before the recommended age of 12 months or later, and one in 10 consumed french fries and/or sweetened beverages on any given day. APPLICATIONS/CONCLUSIONS: More parents and caregivers can benefit from guidance about the introduction of developmentally appropriate, micronutrient-rich first solid foods such as iron-rich infant cereals, iron-fortified grain products, meats, soft fruits, and cooked vegetables and the importance of breastfeeding through the first year of life. A smaller proportion of parents and caregivers require guidance on delaying the introduction of juices until six months of age and cow's milk other than formula until one year of age.

Meal and snack patterns of infants and toddlers.

OBJECTIVE: To describe meal and snack patterns of infants and toddlers. DESIGN: A cross-sectional telephone survey in which mothers reported their infants' and toddlers' food and beverage intakes for a 24-hour period. SUBJECTS: Subjects included 3,022 infants and toddlers, ages 4 to 24 months, in the Feeding Infants and Toddlers Study. STATISTICAL ANALYSES PERFORMED: Means+/-standard deviations, frequencies, percentages, energy and nutrient analyses, nutrient densities. RESULTS: On average, infants and toddlers were fed seven times per day. The breakfast, lunch, and dinner pattern, plus snacks, emerged at 7 to 8 months and was well established by 9 to 11 months. Breakfasts were higher in nutrient density for iron, folate, and calcium than other meals. The percentage of children reported to be eating snacks increased with age. The afternoon snack was consumed by over 80% of toddlers (12 to 24 months), and snacks provided about 25% of toddlers' daily energy intakes. Typical snack foods for toddlers were milk, water, cookies, crackers, chips, and fruit drinks. APPLICATIONS/CONCLUSIONS: Results of this study provide parents and professionals with specific information about meal and snack patterns, thereby allowing development of targeted messages and/or strategies to improve the dietary patterns of infants and toddlers. Although most foods provided to the Feeding Infants and Toddlers Study infants and toddlers were nutritionally and developmentally appropriate, snack choices could be improved by delaying introduction of and limiting exposures to foods low in nutrients and high in calories.

Nutrient intakes and food choices of infants and toddlers participating in WIC.

OBJECTIVES: To examine the nutrient intakes, foods consumed, and feeding patterns of infants and toddlers participating in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC). DESIGN: Cross-sectional telephone survey, including 24-hour dietary recalls of infants' and toddlers' food and nutrient intakes, as reported by parents or other primary caregivers. SUBJECTS: National random sample of 3,022 children ages 4 to 24 months who participated in the 2002 Feeding Infants and Toddlers study. Sample sizes by age were infants 4 to 6 months: 265 WIC participants, 597 nonparticipants; infants 7 to 11 months: 351 WIC participants, 808 nonparticipants; and toddlers 12 to 24 months: 205 WIC participants, 791 nonparticipants. STATISTICAL ANALYSES PERFORMED: We used Statistical Analysis Software (version 8.2) to examine the breastfeeding status, infant feeding patterns, and foods consumed; the personal computer version of the Software for Intake Distribution Estimation to estimate mean usual intake of food energy and of key nutrients targeted by the WIC program; and methods recommended by the Institute of Medicine to assess nutrient adequacy. RESULTS: Infants participating in WIC were less likely than nonparticipants to have ever been breastfed or to be currently breastfeeding, and they were more likely to be consuming formula. Mean usual nutrient intakes exceeded the adequate intake for WIC participants, and the percentage with inadequate nutrient intake was less than 1%. Reported mean energy intakes exceeded mean energy requirements, with the largest discrepancy observed for WIC participants. Sizeable proportions of WIC and non-WIC infants and toddlers did not consume fruits and vegetables on the recall day. APPLICATIONS: WIC providers should focus nutrition education on appropriate infant and toddler feeding patterns, should continue to reinforce their message of the importance delaying the use of cow's milk until 1 year of age, and should stress the importance of fruit and vegetable consumption.

Differences in use of health services between White and African American children enrolled in Medicaid in North Carolina.

OBJECTIVES: Racial differences in health status and use of health services persist in the United States and are not completely explained by differences in socioeconomic status. This study examines differences in use of health services between White and African American children enrolled in Medicaid, controlling for other factors that affect service use. We make comparisons for use of primary preventive services, diagnosis and treatment of selected common childhood illnesses, and Medicaid expenditures. METHODS: We linked Medicaid enrollment records, Medicaid paid claims data, and data on use of child WIC services to birth certificates for North Carolina children born in 1992 to measure use of health services and Medicaid expenditures by race for children ages 1, 2, 3, and 4. Logistic and Tobit regression models were used to estimate the independent effect of race, controlling for other variables such as low birth weight, WIC participation, and mother's age, education, and marital status. Since all children enrolled in Medicaid are in families of relatively low income, racial differences in socioeconomic status are partially controlled. RESULTS: African American children had consistently lower Medicaid expenditures and lower use of health services than did White children, after statistically controlling for other maternal and infant characteristics that affect health service use, including child WIC participation. For example, total annual Medicaid expenditures were 207-303 dollars less for African American children than for White children, controlling for other variables. African America children were significantly less likely to receive well-child and dental services than were White children. CONCLUSIONS: African American children enrolled in Medicaid use health services much less than White children, even when controlling for socioeconomic status and other factors that affect service use. Linking state administrative databases can be a cost-effective way of addressing important issues such as racial disparities in health service use.

Child participation in WIC: Medicaid costs and use of health care services.

OBJECTIVES: We used data from birth certificates, Medicaid, and the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) to examine the relationship of child participation in WIC to Medicaid costs and use of health care services in North Carolina. METHODS: We linked Medicaid enrollment, Medicaid paid claims, and WIC participation files to birth certificates for children born in North Carolina in 1992. We used multiple regression analysis to estimate the effects of WIC participation on the use of health care services and Medicaid costs. RESULTS: Medicaid-enrolled children participating in the WIC program showed greater use of all types of health care services compared with Medicaid-enrolled children who were not WIC participants. CONCLUSIONS: The health care needs of low-income children who participate in WIC may be better met than those of low-income children not participating in WIC.