Table 1 Maternal characteristics of the study population
Characteristics | ≤750 g (n = 25) | 751-1000 g(n = 158) | 1001-1250 g(n = 369) | 1251-1500 g(n = 507) | Total(n = 1059) | F/χ2 | P | P value for Trend |
|---|---|---|---|---|---|---|---|---|
Maternal Age,mean(SD),y | 30.3 ± 4.6 | 31.7 ± 5.6 | 30.5 ± 5.2 | 30.2 ± 5.4 | 30.6 ± 5.4 | 2.911 | 0.034 | 0.023 |
Standard prenatal care(n，%) | 24(96.0%) | 145(91.8%) | 315(85.4%) | 427(84.2%) | 911(86.0%) | 7.916 | 0.048 | 0.025 |
Primary diabetes mellitus(n，%) | 0(0.0%) | 0(0.0%) | 4(1.1%) | 7(1.4%) | 11(1.0%) | 2.505 | 0.474 | 0.142 |
Gestational diabetes mellitus(n，%) | 6(24.0%) | 20(12.7%) | 48(13.0%) | 67(13.2%) | 141(13.3%) | 2.567 | 0.463 | 0.580 |
Essential hypertension(n，%) | 0(0.0%) | 1(0.6%) | 12(3.3%) | 6(1.2%) | 19(1.8%) | 7.190 | 0.066 | 0.913 |
Pregnancy induced hypertension(n，%) | 2(8.0%) | 24(15.2%) | 53(14.4%) | 76(15.0%) | 155(14.6%) | 0.993 | 0.803 | 0.654 |
Prenatal glucocorticoid use(n，%) | 13(52.0%) | 74(46.8%) | 199(53.9%) | 223(44.0%) | 223(21.1%) | 8.697 | 0.034 | 0.080 |
Premature rupture of membranes(n，%) | 0(0.0%) | 16(10.1%) | 57(15.5%) | 116(22.9%) | 189(17.9%) | 22.062 | 0.000 | 0.000 |
Fetal distress(n，%) | 2(8.0%) | 3(1.9%) | 17(4.6%) | 25(4.9%) | 47(4.4%) | 3.465 | 0.325 | 0.382 |
Multiple pregnancy(n，%) | 10(40.0%) | 20(12.7%) | 38(10.3%) | 58(11.4%) | 126(11.9%) | 19.924 | < 0.001 | 0.037 |
Placental abruption(n，%) | 0(0.0%) | 10(6.3%) | 6(1.6%) | 17(3.4%) | 33(3.1%) | 9.015 | 0.029 | 0.606 |
Placenta previa(n，%) | 4(16.0%) | 32(20.3%) | 55(14.9%) | 63(12.4%) | 154(14.5%) | 6.055 | 0.109 | 0.025 |