早发型(n = 124)

晚发型(n = 70)

X²

P值

NRDS

15 (12.1%)

15 (21.4%)

2.980

0.084

围产期因素

65 (52.4%)

20 (28.6%)

10.337

0.001

SGA

19 (15.3%)

5 (7.1%)

2.761

0.097

妊高症

43 (34.7%)

15 (21.4%)

3.747

0.053

宫内窘迫

34 (27.4%)

11 (15.7%)

3.441

0.064

免疫因素

12 (9.7%)

3 (4.3%)

1.823

0.177

NEC

0 (0.0%)

8 (11.4%)

0.000

DIC

6 (4.8%)

2 (2.9%)

0.713

染色体异常

3 (2.4%)

1 (1.4%)

1.000

败血症

9 (7.3%)

12 (17.1%)

4.529

0.033

早发败血症

9 (7.3%)

3 (4.3%)

0.542

晚发败血症

0 (0.0%)

9 (12.9%)

13.930

0.000

其他原因

15 (12.1%)

8 (11.4%)

0.019

0.890