Table 1 Analysis of factors influencing LBW
Variables | Normal | LBW | P | OR | 95% C.I. of OR | ||||
|---|---|---|---|---|---|---|---|---|---|
N | % | N | % | Lower limit | Upper limit | ||||
Maternal age | 21-34 years old | 83301 | 93.5 | 5414 | 6.5 | 0.020 | 1 | ||
≤20 years old | 1767 | 90.6 | 166 | 9.4 | 0.097 | 1.332 | 1.046 | 1.695 | |
≥35 years old | 9960 | 94.4 | 555 | 5.6 | 0.000 | 0.097 | 0.789 | 1.020 | |
Maternal educational level | Illiterate | 1715 | 90.8 | 157 | 9.2 | 1 | |||
Tertiary or higher Technical | 46970 | 94.3 | 2691 | 5.7 | <0.001 | 0.259 | 0.121 | .551 | |
Secondary school, high school, or higher | 30079 | 93.7 | 1906 | 6.3 | 0.004 | 0.332 | 0.156 | .707 | |
Middle school or below | 16264 | 91.5 | 1381 | 8.5 | 0.001 | 0.293 | 0.137 | .624 | |
Parity | 0 | 9940 | 93.0 | 599 | 6.0 | 1 | |||
1 | 68263 | 93.9 | 4155 | 6.1 | 0.055 | 1.561 | 0.991 | 2.459 | |
2 or more | 16825 | 91.8 | 1381 | 8.2 | 0.785 | 0.927 | 0.537 | 1.599 | |
Spontaneous miscarriages | 0 | 92267 | 93.6 | 5898 | 6.4 | 1 | |||
1 or more | 2761 | 91.4 | 237 | 8.6 | 0.023 | 1.362 | 1.043 | 1.777 | |
Stillbirths | 0 | 94650 | 93.6 | 6073 | 6.4 | 1 | |||
1 or more | 378 | 83.6 | 62 | 16.4 | <0.001 | 2.446 | 1.479 | 4.044 | |
GDM | No | 90678 | 93.5 | 5916 | 6.5 | ||||
GDM | 4218 | 94.4 | 239 | 5.6 | 0.935 | 1.010 | .797 | 1.280 | |
DM complicated with pregnancy | 132 | 81.1 | 25 | 18.9 | 0.011 | 0.263 | .094 | .733 | |
Hypertensive disorders in pregnancy | No | 90085 | 94.8 | 4712 | 5.2 | 1 | |||
Yes | 4943 | 71.2 | 1423 | 28.8 | <0.001 | 5.031 | 4.325 | 5.853 | |
Anemia | No | 89039 | 93.7 | 5618 | 6.3 | 1 | |||
Yes | 5989 | 91.4 | 517 | 8.6 | 0.032 | 1.230 | 1.017 | 1.488 | |
Premature rupture of membranes | No | 80983 | 94.5 | 4479 | 5.5 | ||||
Yes | 14045 | 88.3 | 1656 | 11.7 | 0.027 | 1.154 | 1.016 | 1.311 | |
Abnormal amniotic fluid volume | None | 90290 | 92.5 | 5666 | 6.3 | 1 | |||
Too much amniotic fluid | 1162 | 91.2 | 102 | 8.8 | 0.370 | 0.809 | .509 | 1.286 | |
Too little amniotic fluid | 3576 | 89.7 | 367 | 10.3 | <0.001 | 2.068 | 1.659 | 2.578 | |
PTB | No | 93874 | 97.5 | 1863 | 2.5 | ||||
Yes | 1154 | 38.4 | 4272 | 61.6 | <0.001 | 46.246 | 41.484 | 51.555 | |
BMI | 18.5 ~ 24 | 39929 | 94.5 | 2312 | 5.5 | 1 | |||
<18.5 | 6872 | 92.7 | 538 | 7.3 | <0.001 | 1.637 | 1.415 | 1.893 | |
24 ~ 27.9 | 8263 | 93.7 | 554 | 6.3 | 0.026 | 0.840 | .721 | .980 | |
≥28 | 2110 | 93.3 | 151 | 6.7 | 0.001 | 0.620 | .466 | .826 | |
Weight gain | <11 | 13382 | 92.1 | 1146 | 7.9 | 1 | |||
11-13.9 | 11242 | 94.0 | 716 | 6.0 | <0.001 | 0.764 | .660 | .884 | |
14-16.9 | 13318 | 94.3 | 798 | 5.7 | <0.001 | 0.721 | .624 | .831 | |
≥17 | 15637 | 94.2 | 963 | 5.8 | <0.001 | 0.628 | .545 | .723 | |
Height | <0.001 | 0.951 | .941 | .961 | |||||
Constant | <0.001 | 1123.42 | |||||||