Survival Rate of Extremely Low Birth Weight Infants and Its Risk Factors: Case-Control Study in Japan

Table 1

Distribution of delivery weeks in this studied population.

Gestational weeks	Cesarean	Vaginal	Total
22	11	63	74
23	37	121	158
24	111	131	242
25	158	116	274
26	184	95	279
27	168	62	230
28	122	27	149
29	86	20	106
30	68	7	75
31	57	11	68
32	20	4	24
33	14	3	17
34	13	0	13
35	2	0	2
36	0	2	2
Total	1051	662	1713