effective factors in the number of children among iranian women: an application of poisson regression model

Background: the number of children born into a family has a significant impact on a mother’s reproductive system’s physiological health and overall well-being. objectives: this study aimed to explore the effective factors in the number of living children (nlc) among married women in semnan, iran, with a particular focus on social, cultural, and economic influences. methods: this cross-sectional study examined the reproductive histories of 600 married women aged 15 to 49 years from semnan, iran. sample size calculations were based on the principal variable, the expected number of children, using pass software. the women were selected through a multistage random sampling method from health center lists in 2018 (april-october). the data were collected through interview questionnaires and analyzed using the quasi-poisson model. results: the mean (standard deviation [sd]) age at first marriage for mothers (mam) and fathers was estimated to be 21.02 (4.80) and 25.10 (4.70) years, respectively. additionally, the mean (sd) values for the number of expected children (ncex), living children, and the number of pregnancies were 2.19 (0.96), 1.85 (0.81), and 2.15 (1.03), respectively. among the variables of interest, only ncex, the number of pregnancies (with a positive effect), mam, father’s education, multiple births, and the desire to have children (with a negative effect) significantly influenced nlc. conclusions: this study recommends implementing an educational program to promote an optimal and ideal family size to prevent adverse pregnancy outcomes. the age of women at marriage is a significant factor, as an increase in women’s age leads to shorter pregnancy intervals, exposing women to complications, such as premature birth, perinatal death, and intrauterine growth restriction. policymakers should, therefore, encourage early marriages by fostering a culture and providing supportive facilities.