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Table 1 Analysis of factors influencing LBW

From: An epidemiological survey on low birth weight infants in China and analysis of outcomes of full-term low birth weight infants

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