Epidemiology of pregnancies with unknown last menstrual period

the Epidemiology of normal pregnancies with unknown last menstrual period (LMP) was studied in ۱۱۹۲ singleton  pregnancies.the LMP was unknown in ۲۴۰(۲۰.۳%) pregnancies.unknown LMP is associated with high rates of low birth weight and all low socio-economic and socio-demographic status.such characteristics are also associated with a high rate of preterm deliveries.any possible bias introduced in studies prematurity by ignoring the group of women with unknown LMP should be carefully checked.

کلیدواژه ها:

last menstrual period ، gestational age ، Low Birth Weight ، Epidemiology