WIC Infant and Toddler Feeding Practices Study-2 (WIC ITFPS-2): Prenatal, Infant Year, Second Year, Third Year, and Fourth Year Datasets

[2023-05-04 - Added WIC Infant and Toddler Feeding Practices Study-2 Data File Training Manual]
The WIC Infant and Toddler Feeding Practices Study–2 (WIC ITFPS-2) (also known as the “Feeding My Baby Study”) is a national, longitudinal study that captures data on caregivers and their children who participated in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) around the time of the child’s birth. The study addresses a series of research questions regarding feeding practices, the effect of WIC services on those practices, and the health and nutrition outcomes of children on WIC. Additionally, the study assesses changes in behaviors and trends that may have occurred over the past 20 years by comparing findings to the WIC Infant Feeding Practices Study–1 (WIC IFPS-1), the last major study of the diets of infants on WIC. This longitudinal cohort study has generated a series of reports. These datasets include data from caregivers and their children during the prenatal period and during the children’s first four years of life (child ages 1 to 48 months).
A full description of the study design and data collection methods can be found in Chapter 1 of the Second Year Report (https://www.fns.usda.gov/wic/wic-infant-and-toddler-feeding-practices-study-2-second-year-report). A full description of the sampling and weighting procedures can be found in Appendix B-1 of the Fourth Year Report (https://fns-prod.azureedge.net/sites/default/files/resource-files/WIC-ITFPS2-Year4Report-Appendix.pdf).
Processing methods and equipment used
Data in this dataset were primarily collected via telephone interview with caregivers. Children’s length/height and weight data were objectively collected while at the WIC clinic or during visits with healthcare providers. The study team cleaned the raw data to ensure the data were as correct, complete, and consistent as possible.
Study date(s) and duration
Data collection occurred between 2013 and 2018.
Study spatial scale (size of replicates and spatial scale of study area)
Respondents were primarily the caregivers of children who received WIC services around the time of the child’s birth.
Level of true replication
Unknown
Sampling precision (within-replicate sampling or pseudoreplication)
This dataset includes sampling weights that can be applied to produce national estimates. A full description of the sampling and weighting procedures can be found in Appendix B-1 of the Fourth Year Report (https://fns-prod.azureedge.net/sites/default/files/resource-files/WIC-ITFPS2-Year4Report-Appendix.pdf).
Level of subsampling (number and repeat or within-replicate sampling)
A full description of the sampling and weighting procedures can be found in Appendix B-1 of the Fourth Year Report (https://fns-prod.azureedge.net/sites/default/files/resource-files/WIC-ITFPS2-Year4Report-Appendix.pdf).
Study design (before–after, control–impacts, time series, before–after-control–impacts)
Longitudinal cohort study.
Description of any data manipulation, modeling, or statistical analysis undertaken
Each entry in the dataset contains caregiver-level responses to telephone interviews. Also available in the dataset are children’s length/height and weight data, which were objectively collected while at the WIC clinic or during visits with healthcare providers. In addition, the file contains derived variables used for analytic purposes. The file also includes weights created to produce national estimates.
The dataset does not include any personally-identifiable information for the study children and/or for individuals who completed the telephone interviews.
Description of any gaps in the data or other limiting factors
Please refer to the Second Year Report (https://www.fns.usda.gov/wic/wic-infant-and-toddler-feeding-practices-study-2-second-year-report) for a detailed explanation of the study’s limitations.
Outcome measurement methods and equipment used
The majority of outcomes were measured via telephone interviews with children’s caregivers. Dietary intake was assessed using the USDA Automated Multiple Pass Method (https://www.ars.usda.gov/northeast-area/beltsville-md-bhnrc/beltsville-human-nutrition-research-center/food-surveys-research-group/docs/ampm-usda-automated-multiple-pass-method/). Children’s length/height and weight data were objectively collected while at the WIC clinic or during visits with healthcare providers.
See file list for descriptions of each data file.

【2023-05-04 - 添加WIC婴儿及幼儿喂养实践研究-2数据文件培训手册】WIC婴儿及幼儿喂养实践研究-2（简称WIC ITFPS-2，亦称“喂养我的宝宝研究”）是一项全国性的纵向研究，收集了在儿童出生时参与特殊补充营养计划（WIC）的照护者和他们的孩子的数据。该研究针对一系列关于喂养实践、WIC服务对那些实践的影响，以及WIC儿童的健康和营养结果的研究问题。此外，通过将研究结果与WIC婴儿喂养实践研究-1（WIC IFPS-1），即关于WIC婴儿饮食的最后一次重大研究进行比较，评估了过去20年中可能发生的行为变化和趋势。此项纵向队列研究已生成一系列报告。这些数据集包括照护者和他们的孩子在孕期以及孩子出生后的前四年生活中的数据（儿童年龄为1至48个月）。关于研究设计和数据收集方法，可在第二年度报告的第1章中找到详细描述（https://www.fns.usda.gov/wic/wic-infant-and-toddler-feeding-practices-study-2-second-year-report）。关于抽样和加权程序的完整描述，可在第四年度报告的附录B-1中找到（https://fns-prod.azureedge.net/sites/default/files/resource-files/WIC-ITFPS2-Year4Report-Appendix.pdf）。数据处理方法和设备使用：此数据集中的数据主要通过电话访谈收集自照护者。儿童的身高/体重数据在WIC诊所或与医疗服务提供者的访问期间客观收集。研究团队对原始数据进行清理，以确保数据尽可能准确、完整和一致。研究日期和持续时间：数据收集发生在2013年至2018年之间。研究空间尺度（复制品的大小和研究区域的空间尺度）：受访者主要是儿童出生时接受WIC服务的照护者。真实复制的水平：未知。抽样精度（复制品内抽样或伪复制）：此数据集包括可用于产生全国估计的抽样权重。关于抽样和加权程序的完整描述，可在第四年度报告的附录B-1中找到（https://fns-prod.azureedge.net/sites/default/files/resource-files/WIC-ITFPS2-Year4Report-Appendix.pdf）。子抽样水平（抽样次数和重复或复制品内抽样）：关于抽样和加权程序的完整描述，可在第四年度报告的附录B-1中找到（https://fns-prod.azureedge.net/sites/default/files/resource-files/WIC-ITFPS2-Year4Report-Appendix.pdf）。研究设计（前后对照、控制-影响、时间序列、前后对照-影响）：纵向队列研究。任何数据操作、建模或统计分析的描述：数据集中的每一项都包含对电话访谈的照护者水平的响应。此外，数据集中还包括了在WIC诊所或与医疗服务提供者的访问期间客观收集的儿童的身高/体重数据。此外，文件还包含用于分析目的的派生变量。文件还包括用于产生全国估计的权重。数据集不包含任何关于研究儿童和/或完成电话访谈的个人身份信息。数据缺失或其他限制因素的描述：请参阅第二年度报告（https://www.fns.usda.gov/wic/wic-infant-and-toddler-feeding-practices-study-2-second-year-report）以获取关于研究限制的详细解释。结果测量方法和设备使用：大多数结果是通过电话访谈儿童的照护者来测量的。饮食摄入量是通过使用美国农业部自动化多遍法（https://www.ars.usda.gov/northeast-area/beltsville-md-bhnrc/beltsville-human-nutrition-research-center/food-surveys-research-group/docs/ampm-usda-automated-multiple-pass-method/）来评估的。儿童的身高/体重数据在WIC诊所或与医疗服务提供者的访问期间客观收集。请参阅文件列表以获取每个数据文件的描述。