Reproductive and lifestyle factors associated with early menopause in Mexican women

The purpose of this study was to evaluate the relationship between certain reproductive and lifestyle factors and the occurrence of early natural menopause. A case/control study was conducted on a basal population of 2510 women participating in the "Mexican Institute of Social Security health workers cohort study". Cases were defined as those women for whom natural menopause presented by age 47. Information was obtained through a self-administered questionnaire. The risk of early menopause is associated with short menstrual cycles [