Table 2. Mode of delivery according to weeks of gestation (WG) and Apgar scor (AS) in singleton (S) and twins (T) delivery, Vaginal delivery (VD), Caesarean section (CS).

WG AS	VD		CS		χ2	P	OR	95% CI
AS <4 1'	N=113		N= 106
<28	54		19		0.00	1.000	0.71	0.02-7.82
28-32	33		38		0.11	0.744	0.87	0.48-1.56
33-37	26		49		12.18	0.0005	0.416	0.24-0.69
<28	S	T	S	T	1.58	0.209	2.65	0.63-10.51
	46	8	13	6
28-32	25	8	30	8	0.001	0.748	0.83	0.23-2.97
33-37	25	1	32	17	7.25	0.007	13.28	1.79-576.8
AS 5-7 1'	N=87		N= 162
<28	4		1		0.00	1.000	1.33	0.12-69.07
28-32	15		33		6.86	0.009	0.38	0.18-0.80
33-37	68		128		36.93	<0.0001	0.38	0.27-0.52
28-32	11	4	25	8	0.00	1.000	0.88	0.18-4.87
33-37	56	12	81	47	6.80	0.009	2.71	1.27-6.10
AS 8-10 1'	N=636		N= 406
28-32	48		20		7.65	0.006	2.37	1.27-4.44
33-37	588		386		55.42	<0.0001	2.87	2.15-3.84
28-32	38	10	16	14	4.63	0.031	3.33	1.09-10.21
33-37	535	53	242	144	113.86	<0.0001	6.00	4.18-8.69
AS <4 5'	N=91		N= 62
<28	47		19		1.28	0.257	0.22	0.005-1.78
28-32	24		23		0.17	0.842	1.13	0.56-2.30
33-37	20		20		0.21	0.649	0.82	0.41-1.62
<28	41	6	13	6	2.10	0.149	3.15	0.79-13.91
28-32	22	2	19	4	0.24	0.622	2.32	0.29-27.8
33-37	19	1	16	4	0.91	0.339	4.75	0.40-246.00
AS 5-7 5'	N=54		N= 113
28-32	18		36		6.24	0.013	0.42	0.20-0.84
33-37	30		77		1.31	0.250	0.75	0.46-1.20
28-32	11	7	29	7	1.46	0.227	0.38	0.09-1.62
33-37	26	4	43	34	7.66	0.006	5.13	1.55-21.91
AS 8-10 5'	N=691		N= 509
<28	5		1		0.001	0.97	1.79	0.18-89.18
28-32	54		42		3.67	0.055	1.81	0.99-3.31
33-37	632		466		28.07	<0.0001	2.63	1.81-3.86
28-32	41	13	71	30	0.31	0.577	1.33	0.59-3.10
33-37	571	61	296	170	114.61	<0.0001	5.38	3.85-7.56