en Gynecology & Obstetrics Gynecology & Obstetrics Original Research Original Research Using a cluster sampling method, a group of menopausal women from three geographic areas in Tehran were asked to participate in the study. Demographic data was obtained using a questionnaire. Subjects were than referred to perform bone mass densitometry (BMD). The relationship between various variables (i.e. age of menarche, number of years of endogenous estrogen exposure, ... ) with mineral density of the lumbar spine and femur were sought. Results showed that the incidence of bone loss during menopause was high among these women. Earlier age of menarche and longer reproductive years, higher BMI, previous usage of OCP and HRT are likely to increase BM. Being active at home and doing household chores can greatly influence the BMD of the femur. Poor dietary calcium intake may be the main reason for low BMD among the studied subjects. 231 235 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-298-312&slc_lang=en&sid=1 S JAHANFAR 20031947532846004350 20031947532846004350 Yes the Department of Obstetrics and Gynecology, Iran University of Medical Sciences, Tehran M SADAT HASHEMI 20031947532846004351 20031947532846004351 No the Department of Obstetrics and Gynecology, Ghazvin University of Medical Sciences, Ghazvin, I.R. Iran F RAMEZANI TEHRANI 20031947532846004352 20031947532846004352 No Gazvin Medical University, NRCRH