The reliability of recalled estimates of menarcheal age in a sample of older women.

The accuracy of recalled age at first menses has been questioned, particularly if subjects are relatively old. This paper illustrates the use of a statistical technique that quantifies the reliability of recalled age at menarche based on re-interview of a small (15-20) subsample of subjects. Menarcheal age collected with the retrospective method in a sample of 108 females, 50 years of age and older, from Limón, Costa Rica, is reliable.