Among 143 women whose menarcheal age was documented during a longitudinal growth study, recall 39 years after the even gave the following results: menarche was recalled as 0.2 years after earlier than the actual date (p<0.05), the standard deviation of recalled age was 0.3 years larger (p<0.01), and the coefficient of correlation, r, between actual and recalled age was 0.60 +/- s.e. 0.05.
Biology | Obstetrics and Gynecology
Damon, Albert and Bajema, Carl J., "Age at Menarche: Accuracy of Recall After Thirty-Nine Years" (1974). Peer Reviewed Publications. Paper 29.