Table 2.

Demographic characteristic and the first birth interval according to gender

Variable	Adjusted OR	95% CI	P value
Mother’s age (Y)	1.04	1.01-1.09	0.044
ART	6.11	1.70-21.97	0.006
History of multiple pregnancy in mother’s family	5.94	3.55-9.93	0.001
Type of pregnancy	0.81	0.44-1.51	0.518
History of infertility	0.94	0.27-3.25	0.929
History of multiple pregnancy in father’s family	1.31	0.79-2.17	0.293
Mother as the outcome of multiple pregnancy	1.30	0.38-4.47	0.669
Father as the outcome of multiple pregnancy	1.88	0.43-8.24	0.399

ART; Assisted reproductive technique, OR; Odds ratio, and CI; Confidence interval.