Table 3.

Univariate and multivariate analysis of predictors for multiple pregnancies outcome.

	Number of patients	Univariate analysis	P	Multivariate analysis	P
		Hazard ratio		Hazard ratio
		(95% CI)		(95% CI)
Total	253
Age < 35 years	186	1.00		1.00
Age ≥ 35 years	67	2.44 (138–4.31)	0.002	2.29 (1.26–4.16)	0.014
Treatment IUI
No	230	1.00
Yes	23	0.41 (0.17–0.98)	0.044
Preexisting recognition of risks of multiple pregnancy
No	54	1.00		1.00
Yes	187	0.30 (0.16–0.56)	<0.001	0.30 (0.16–0.57)	<0.001