Table 6.

Factors independentlyassociated with a 5 min Apgar score below 7 among neonates from twin pregnancies: stepwise multiple analyses by nonconditional logistic regression, Brazil, SINASC 2011-2014.

Variables [n=58 850]	Apgar score	ORadj	95% CI	p-value
Number of prenatal visits <7	Both <7	2.378	1.898-2.978	<0.0001
	1st <7	1.767	1.489-2.097	<0.0001
	2nd <7	1.517	1.294-1.780	<0.0001
Gestational age <32 weeks	Both <7	30.772	21.901-43.236	<0.0001
	1st <7	10.657	8.438-13.460	<0.0001
	2nd <7	8.029	6.465-9.972	<0.0001
Gestational age 32-36 weeks	Both <7	2.453	1.709-3.521	<0.0001
	1st <7	2.134	1.717-2.653	<0.0001
	2nd <7	2.006	1.656-2.431	<0.0001
Intrapartum cesarean	Both <7	1.266	1.012-1.584	0.0393
	1st <7	0.954	0.803-1.133	0.5918
	2nd <7	1.249	1.060-1.471	0.0079
Cesarean for the 2nd twin	Both <7	1.977	0.472-8.287	0.3510
	1st <7	1.115	0.272-4.565	0.8798
	2nd <7	16.270	10.409-25.432	<0.0001
Vaginal birth for both	Both <7	3.440	2.488-4.754	<0.0001
	1st <7	1.631	1.190-2.235	0.0023
	2nd <7	2.518	1.915-3.312	<0.0001

Predictors entering the models: maternal age, schooling, marital status, parity, number of previous cesarean sections, number of prenatal visits, place of birth, gestational age at birth, onset of labor, mode of delivery, ethnicity, and HDI.