Table 1 The univariate analysis of risk factors of preterm SGA infants (categorical variables)
Risk factors | Number of SGA | Number of Non-SGA | P value |
|---|---|---|---|
Maternal Education years | |||
 0 | 2 | 27 | 0.000 |
 0–6 | 19 | 444 |  |
 6–9 | 181 | 7743 |  |
 9–12 | 71 | 1713 |  |
 12–16 | 38 | 966 |  |
  > 16 | 1 | 6 |  |
Paternal Education years | |||
 0 | 1 | 13 | 0.008 |
 0–6 | 13 | 337 |  |
 6–9 | 189 | 7464 |  |
 9–12 | 70 | 1922 |  |
 12–16 | 33 | 1066 |  |
  > 16 | 0 | 10 |  |
Maternal intake of narcotics | |||
 Yes | 4 | 29 | 0.012 |
 No | 208 | 10,782 |  |
Paternal second-hand smoking | |||
 Regular | 13 | 358 | 0.091 |
 Occasional | 90 | 3732 |  |
 No | 191 | 6089 |  |
Maternal intake of eggs and meat | |||
 No | 9 | 155 | 0.045 |
 Yes | 292 | 10,675 |  |
Maternal intake of vegetable | |||
 No | 10 | 94 | 0.000 |
 Yes | 290 | 10,737 |  |
Maternal intake of folic acid from at least 3Â months before LMP | |||
 Yes | 73 | 3448 | 0.003 |
 No | 241 | 7584 |  |
Paternal intake of eggs or meat | |||
 No | 8 | 125 | 0.003 |
 Yes | 286 | 10,073 |  |
Paternal intake of vegetables | |||
 No | 5 | 81 | 0.094 |
 Yes | 289 | 10,104 |  |
Maternal tense relationship with relatives and co-workers | |||
 No | 272 | 10,098 | 0.000 |
 Low | 29 | 597 |  |
 Moderate | 0 | 143 |  |
 High | 2 | 3 |  |
Paternal tense relationship with relatives and co-workers | |||
 No | 261 | 9403 | 0.075 |
 Low | 2 | 627 |  |
 Moderate | 4 | 162 |  |
 High | 0 | 5 |  |
Paternal exposure to heavy metals | |||
 Yes | 4 | 28 | 0.011 |
 No | 313 | 11,489 |  |
Paternal exposure to organic solutes | |||
 Yes | 5 | 528 | 0.006 |
 No | 312 | 10,989 |  |
Paternal exposure to vibrations | |||
 Yes | 4 | 54 | 0.076 |
 No | 313 | 11,463 |  |
Maternal syphilis infection | |||
 Yes | 4 | 29 |  |
 No | 293 | 10,656 |  |
Maternal Candida infection | Â | Â | Â |
 Yes | 2 | 80 | 0.003 |
 No | 269 | 10,138 |  |
Maternal HBe antibodies | |||
 Positive | 31 | 770 | 0.024 |
 Negative | 255 | 9855 |  |
Maternal rubella virus IgG antibodies | |||
 Positive | 136 | 4114 | 0.022 |
 Negative | 153 | 6355 |  |
Maternal CMV IgG antibodies | |||
 Positive | 79 | 2312 | 0.068 |
 Negative | 204 | 8022 |  |
Maternal toxoplasma IgG antibodies | Â | Â | Â |
 Positive | 9 | 148 | 0.052 |
 Negative | 273 | 10,190 |  |
Paternal HBs antibodies | |||
 Positive | 83 | 2555 | 0.077 |
 Negative | 198 | 7413 |  |
Maternal medication us after LMP | |||
 Yes | 20 | 274 | 0.000 |
 No | 294 | 10,758 |  |
Maternal pet exposure after LMP | |||
 Yes | 11 | 171 | 0.018 |
 No | 305 | 10,942 |  |
Maternal influenza virus infection after LMP | |||
 Yes | 9 | 92 | 0.002 |
 No | 305 | 11,021 |  |
Maternal medical history of hepatitis B | |||
 Yes | 4 | 51 | 0.076 |
 No | 299 | 10,811 |  |
Maternal oral contraceptive use | |||
 Yes | 4 | 56 |  |
 No | 300 | 10,732 |  |
Maternal family history of neonatal death | |||
 Yes | 2 | 4 | 0.010 |
 No | 300 | 10,846 |  |
Paternal hepatitis B vaccination | |||
 Yes | 66 | 2980.017 |  |
 No | 230 | 7273 |  |
Paternal family history of DM | |||
 Yes | 4 | 47 | 0.055 |
 No | 292 | 10,716 |  |
Location | |||
 North | 60 | 3671 | 0.000 |
 South | 257 | 7486 |  |