Associated factors of first-birth interval among women in reproductive age, addressing maternal and child health

Table 3 Results of the multiple Cox proportional hazards analysis (adjusted analysis) to evaluated factors related to FBI among women

	\(\beta\)	HR	Se (β)	95% CI for HR	P-value
Women’s predictors
Women’s age at marriage	− 0.392	1.479	0.357	1.32–2.48	0.023
Age at the first menstruation	− 0.428	1.534	0.329	1.24–2.53	0.035
Women’s drug use vs. none	− 0.013	1.013	0.108	0.16–1.92	0.872
Women’ s BMI	0.548	1.729	0.447	1.54–2.77	0.014
Women’s underlying disease	− 0.012	1.012	0.107	0.87–1.68	0.882
High school and Diploma vs. illiterate	− 0.071	1.074	0.077	0.33–1.59	0.346
University education vs. illiterate	0.387	1.473	0.257	1.35–2.57	0.026
Contraception use	0.822	2.275	0.133	1.12–2.86	< 0.001
Night job of mother vs. daily	− 0.067	1.069	0.097	0.26–1.81	0.368
Husband’s predictors
Husband’s age at marriage	− 0.632	1.881	0.003	1.62–2.03	< 0.001
High school and Diploma vs. illiterate	− 0.043	1.044	0.071	0.22–1.98	0.624
University education vs. illiterate	0.331	1.392	0.347	1.32–2.51	0.021
Husband drug use vs. None	0.041	1.042	0.055	0.27–1.87	0.488
Night job of husband vs. daily	− 0.013	1.013	0.106	0.23–1.78	0.762
Family predictors
Family marriage vs. not family	− 0.015	1.015	0.104	0.24–1.91	0.771
Rural residence vs. town	− 0.712	2.041	0.431	1.26–2.95	0.031
Income sufficiency vs. not sufficient	0.813	2.255	0.141	1.12–2.96	< 0.001
Having engagement period vs. none	− 0.617	1.853	0.033	1.52–3.05	0.021

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