Table 3.

Comparison of perinatal complications in babies between singleton and twin deliveries

Perinatal indicators	Statistics	Fresh self		Fresh recipient		Thaw self		Thaw recipient		Combined
		Single (n=280)	Twins (n=228)	Single (n=254)	Twins (n=266)	Single (n=272)	Twins (n=206)	Single (n=91)	Twins (n=64)	Single (n=897)	Twins (n=764)
Weight of baby (kg)	Mean±SD	2.76±0.54	2.03±0.55	2.61±0.68	2.01±0.56	2.78±0.75	2.06±0.63	2.63±0.79	1.84±0.57	2.71±0.68	2.02±0.58
	P	<0.001*		<0.001*		<0.001*		<0.001*		<0.001*
Death of child (still birth + early + late neonatal death)	n (%)	8 (2.9)	16 (7.0)	14 (5.5)	11 (4.1)	16 (5.9)	21 (10.2)	3 (3.3)	9 (14.1)	41 (4.6)	57 (7.5)
	OR (95% CI)	2.57 (1.08-6.11)		0.74 (0.33-1.66)		1.82 (0.92-3.58)		4.80 (1.25-18.5)		1.68 (1.11-2.55)
	P	0.03*		0.46		0.08		0.03*		0.01*
Still birth	n (%)	6 (2.1)	8 (3.5)	12 (4.7)	5 (1.9)	7 (2.6)	14 (6.8)	2 (2.2)	3 (4.7)	27 (3.0)	30 (3.9)
	OR (95% CI)	1.66 (0.57-4.86)		0.39 (0.13-1.11)		2.76 (1.09-6.97)		2.19 (0.36-13.49)		1.32 (0.78-2.24)
	P	0.35		0.07		0.03*		0.41		0.31
Early neonatal death	n (%)	2 (0.7)	7 (3.1)	2 (0.8)	3 (1.1)	8 (2.9)	7 (3.4)	1 (1.1)	4 (6.3)	13 (1.5)	21 (2.8)
	OR (95% CI)	4.40 (0.91-21.4)		1.44 (0.24-8.67)		1.16 (0.41-3.25)		6.00 (0.65-55.0)		1.92 (0.96-3.86)
	P	0.09		1		0.78		0.16		0.06
Late neonatal death	n (%)	0 (0.0)	1 (0.4)	0 (0.0)	3 (1.1)	1 (0.4)	0 (0.0)	0 (0.0)	2 (3.1)	1 (0.1)	6 (0.8)
	OR (95% CI)	NC		NC		NC		NC		7.09 (0.85-59.04)
	P	0.45		0.25		1		0.17		0.05
Congenital anomalies	n (%)	4 (1.4)	3 (1.3)	8 (3.2)	4 (1.5)	6 (2.2)	8 (3.9)	2 (2.2)	0 (0.0)	20 (2.2)	15 (2.0)
	OR (95% CI)	0.92 (0.2-4.15)		0.47 (0.14-1.58)		1.79 (0.61-5.25)		NC		0.88 (0.45-1.73)
	P	1		0.25		0.28		0.51		0.71

*P<0.05; Statistically significant. n=Number of babies, SD=Standard deviation, OR=Odds ratio, CI=Confidence interval, NC=Not calculable due to presence of zero in outcome