Goals of future research
Optimizing WIC operations, however, is only half the battle, considering the evidence gaps revealed by the review.
Dr. Rita Hamad
“We still need stronger studies that use more rigorous study designs ... to provide more convincing evidence to policymakers, as well as more evidence on long-term impacts,” Dr. Hamad said. “We also need to better understand why take-up is low in these programs despite these potential health benefits. Then we can make sure that economically disadvantaged families receive the benefits for which they are eligible through interventions to improve participation rates.”
Ideally, WIC programs would receive additional funding for independent parties to evaluate health outcomes, according to Ashwini Lakshmanan, MD, MS, MPH, associate professor in the department of health systems science at Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, Calif.
Dr. Lakshmanan, who previously evaluated the benefits of WIC participation for high-risk infants, noted that randomized clinical trials would be unethical in this setting, yet data collection can still be “very conscientious and intentional,” with a focus on policy-shaping outcome metrics like immunizations and pediatric health care visits.
“The main point is thinking about it at the forefront, and not retrospectively,” Dr. Lakshmanan said.
Dr. Ogunwole, who led the present review, suggested in a written comment that future studies “could employ robust statistical methods (propensity matching, fixed effects models, etc.) to help reduce bias.”
She also recommended evaluating innovations in WIC programs; for example, adding a health coach, or conducting a cooking skills intervention.
Studies are also needed to better understand the various obstacles to WIC success, such as misconceptions about the program, discrimination, and barriers to enrollment, Dr. Ogunwole added.
“WIC enrollment has been decreasing for a number of years, and this was occurring prepandemic as well,” she said. “More work needs to be done to understand this issue.”
The study was supported by the Agency for Healthcare Research and Quality, U.S. Department of Health & Human Services. The investigators and interviewees disclosed no conflicts of interest.