Table 2.

Fetal and neonatal outcomes

Variable	Singleton (N = 161)	First twin (N = 77)	Second twin (N = 77)	p
Outcome
Livebirth	156 (96.9%)	75 (97.4%)	77 (100%)	0.728; 0.295*
Neonatal Death	1 (0.6%)	1 (1.3%)	0
Stillbirth	4 (2.5%)	1 (1.3%)	0
Arterial cord blood pH	7.30 (0.12)	7.31 (0.07)	7.29 (0.11)	0.940; 0.687*
Arterial cord blood pH < 7	0	1 (0.01%)	0	0.106; 1*
Venous cord blood pH	7.33 (0.07)	7.35 (0.05)	7.35 (0.03)	0.096; 0.436*
Apgar test score 5`	10 (1)	10 (0)	10 (1)	0.069; 0.294*
Birthweight, grams **	2,317.2 (445.8)	2,160.4 (480.7)	2,538.4 (881.4)	0.171; 0.026*
Birthweight, centile	30 (58)	30 (50.5)	15 (33)	0.999; 0.005*
Birthweight < 10th centile	48 (30.6%)	19 (25%)	32 (41.6%)	0.379; 0.097*
nICU admission	28 (17.8%)	6 (7.8%)	10 (13.0%)	0.041; 0.345*
nICU admission time, days	15.0 (19)	7.5 (5)	7.0 (5)	0.174; 0.029*
Neonatal complications	47 (29.2%)	23 (30.0%)	21 (27.3%)	0.890; 0.790
Ventilation	36 (22.4%)	13 (16.9%)	8 (10.4%)	0.300; 0.024*
Intubation	16 (9.9%)	2 (2.6%)	2 (2.6%)	0.060; 0.058*
Intubation time, days	2.0 (2)	1 (66)	3.5 (1)	0.995; 0.659*
CPAP	30 (18.6%)	8 (10.4%)	6 (7.8%)	0.099; 0.029*
CPAP time, days	0 (1)	2 (4)	1.75 (2)	0.001; 0.012*
RDS	36 (22.4%)	12 (15.6%)	7 (9.1%)	0.204; 0.013*
Phototherapy	29 (18.0%)	12 (15.6%)	16 (20.8%)	0.602; 0.674
Phototherapy, days	2 (2)	1 (1)	1.5 (1)	0.389; 0.789*
Intraventricular hemorrhage	2 (1.2%)	2 (2.6%)	0	0.464; < 0.001*
Anemia	7 (4.3%)	4 (5.2%)	2 (2.6%)	0.790; 0.492*
Blood transfusion	4 (2.5%)	2 (2.6%)	2 (2.6%)	0.976; 0.982*
Necrotizing enterocolitis	4 (2.5%)	1 (1.3%)	0	0.550; < 0.001*
Retinopathy	6 (3.7%)	1 (1.3%)	0	0.316; < 0.001*
Sepsis	5 (3.1%)	2 (2.6%)	3 (3.9%)	0.812; 0.779*

Values are median (Interquartile range) or absolute frequency (relative frequency). Statistically significant comparisons are represented in bold

nICU neonatal intensive care unit, IMV Invasive Mechanical Ventilation. RDS Respiratory Distress Syndrome. *Comparing second twin with singleton with Bonferroni correction. **Variables reported as means (standard deviation)