Distributions of postpartum amenorrhea: some new evidence.

This study examines empirical distributions of postpartum amenorrhea from three longitudinal studies of breastfeeding women conducted in Bangladesh, India, and Guatemala, both to provide information on the distribution of postpartum amenorrhea and to evaluate statistical models of postpartum amenorrhea. Observation of the empirical schedules indicates that the most common shape for a distribution of postpartum amenorrhea is bimodal. Amenorrhea is best represented by a curve that consists of two hills. Both an analytic model consisting of a mixed distribution and a logit model with a revised standard are suggested for use with data on postpartum amenorrhea. [ABSTRACT FROM AUTHOR]