J H Calhoun, B L Allen, J Meek-Chilton, R Clark
Computer-assisted instruction in orthopedic biomechanics
The Orthopedic clinics of North America
regularity menstrual cycles important indicator womens health fertility female workers exposed several factors sleep disorders stress shift work affect menstrual regularity makes necessary comprehensively identify determinants menstrual regularity therefore study identified factors affecting menstrual regularity among female workers physiological psychological situational dimensions based theory unpleasant symptoms secondary analysis 20102012 korea national health nutrition examination survey utilized data 2418 female workers based theory unpleasant symptoms physiological factors included age age menarche childbirth experience body mass index sleep duration psychological factors included stress level depressive mood suicidal ideation situational factors included education level household income consumption alcohol engagement smoking work schedule test hierarchical logistic regression analysis performed reflecting complex sample design age menarche childbirth experience body mass index among physiological factors education level work schedule among situational factors found related menstrual regularity higher risk menstrual irregularities found among given birth versus high age menarche versus low age menarche obese versus normal body mass index elementary schoollevel lesser educational achievements versus college graduatelevel higher educational achievements shift work schedule versus fixed schedule intervention needed female workers risk factors special attention must paid female workers shift work schedule additionally since body mass index controlled intervention concerning body mass index necessary reduce menstrual irregularity