Table 7.

Respiratory distress syndrome occurrence rate.

Gestational week	Non–respiratory distress syndrome (n=3046), n	Respiratory distress syndrome (n=10,041), n	Total (N=13,087), n	Respiratory distress syndrome rate (%) (total=76.72%)
22	3	124	127	97.63
23	7	457	464	98.49
24	15	740	755	98.01
25	18	953	971	98.14
26	34	1160	1194	97.15
27	72	1301	1373	94.75
28	126	1557	1683	92.51
29	245	1550	1795	86.35
30	469	1044	1513	69
31	497	619	1116	55.46
32	468	302	770	39.22
33	413	125	538	23.23
34	370	66	436	15.13
35	222	32	254	12.59
36	87	11	98	11.22