Modeling the Factors Affecting the First Birth in the Family's' Fertility in Hamedan Province

The role of fertility as the most important determinant of demographic fluctuations
has given more importance to its studies compared with other demographic phenomena. In this
context, different indexes are used to measure fertility patterns where the index of the first birth
after marriage has received much attention.
Materials and Methods: This was a cross-sectional (descriptive-analytic) study in which the fertility
data of women are converted into a fictitious cohort and investigated. In this study, married woman
in the age group of 15 to 49 years in 500 families in Hamedan were selected. In this study, aresearcher-made questionnaire was used that included information related to the number of live
births (fertility) and factors related to it (i.e. date of marriage, age, the first pregnancy, number of
unwanted pregnancies, average interval between children, and the use of contraceptives).
Univariate and multivariate survival analysis was carried out for the interval between marriage and
the first birth. In the univariate section, using Kaplan-Meir method and log-rank test, survival
functions of the interval between the first births after marriage in different predictive variables were
compared.
Result: Mean age of mothers at the first birth was 22.04±4.357 years and mean number of live
births was 2.18±0.904. The first marriage age of women, parental education, women’s
employment, the use of contraceptives, and the number of live births were at a significance level of
5%.
Conclusion: It can be concluded that parental education, women’s employment, and use of
contraceptives play important roles in population growth.