Reproducibility of Age at Menarche Gathered From Mail Questionnaires: A Report From the Life Span Study.

ABSTRACT:

Background

Menarche timing may affect female health. While previous studies evaluated self-reported age at menarche reproducibility, they did not assess types of respondents. This study compared the reproducibility of age at menarche among self-responders and proxy respondents and assessed proxy-respondent reproducibility by relationship and survey age.

Methods

Data on age at menarche reported in both the 1969 and 1978 mail questionnaires among 9,043 females from the Life Span Study cohort of atomic bomb survivors were analyzed. The reproducibility of menarcheal age was assessed by the type of respondents, by proxy's relationship to participant, and by age at the 1969 survey using Bland-Altman's method and the intraclass correlation coefficient (ICC).

Results

Reproduc

SUBMITTER: Kadowaki Y 

PROVIDER: S-EPMC12527403 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature