轻度减少(n = 125)

中度减少(n = 53)

重度减少(n = 16)

X²

P值

RDS

20 (16.0%)

9 (17.0%)

1 (6.3%)

1.160

0.640

围产期因素

60 (48.0%)

19 (35.8%)

6 (37.5%)

2.515

0.284

SGA

18 (14.4%)

4 (7.5%)

2 (12.5%)

1.613

0.449

妊高症

43 (34.4%)

11 (20.8%)

4 (25.0%)

3.506

0.170

宫内窘迫

29 (23.2%)

10 (18.9%)

6 (37.5%)

2.395

0.302

免疫因素

7 (5.6%)

8 (15.1%)

0 (0.0%)

0.077

NEC

1 (0.8%)

3 (5.7%)

4 (25.0%)

0.000

DIC

4 (3.2%)

2 (3.8%)

2 (12.5%)

0.260

染色体异常

1 (0.8%)

3 (5.7%)

0 (0.0%)

0.146

败血症

14 (11.2%)

6 (11.3%)

1 (6.3%)

0.805

早发败血症

9 (7.2%)

3 (5.7%)

0 (0.0%)

0.806

晚发败血症

5 (4.0%)

3 (5.7%)

1 (6.3%)

0.851

其他原因

18 (14.4%)

3 (5.7%)

2 (12.5%)

0.213