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Updated: Aug 15, 2025

Breakfast Habits among Schoolchildren in the City of Uruguaiana, Brazil
Published on: July 29, 2020
Provision of educational events and subsequent questionnaire response rates in a large-scale birth cohort study from
Akiko Tsuchida1,2, Mika Kigawa3,4, Kenta Matsumura3,2
1Department of Public Health, Faculty of Medicine, University of Toyama, Toyama, Japan aktsuchi@med.u-toyama.ac.jp.
Objectives:
We examined whether providing educational events for participants in a birth cohort study would increase the response rates of study questionnaires.
Design:
Birth cohort study.
Setting:
Questionnaires were distributed and returned by post twice in 1 year. We developed and implemented two educational sessions; a Baby Food lecture for mothers with children around 8 months old (analysis 1) and a Eurythmic session for mothers with children around 1 year and 8 months old (analysis 2). Mothers with children over the target ages were not invited (not-invited group). The invited participants were divided into three groups: those who did not apply to attend (not-applied group), those who applied but did not attend (applied group), and those who applied and attended (attended group).
Participants:
The participants were 5379 mother-child pairs registered with the Toyama Regional Center of the Japan Environment and Children's Study (JECS).
Outcome Measure:
The outcome measure was return of the JECS questionnaire for 1 year old sent out after the Baby Food lecture and the JECS questionnaire for 2 years old sent out after the Eurythmic session. The questionnaires were returned to us by post.
Results:
The response rate for the attended group of the Baby Food lecture was 99.7%, and the odds ratio (OR) was significantly higher for this group than for the not-invited group (crude OR 24.54; 95% confidence interval (CI) 3.42 to 176.13; analysis 1). After the exclusion of participants who had previously attended the Baby Food lecture, the response rate for the attended group of the Eurythmic session was 97.8%, and the OR was significantly higher for this group than for the not-invited group (adjusted OR 5.66; 95% CI 1.93 to 16.54; analysis 2).
Conclusion:
Providing educational events that are appropriate to the age and needs of the participants may increase questionnaire response rates in birth cohort studies.
Trial Registration Number:
UMIN 000030786.
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