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Table 1 The univariate analysis of risk factors of preterm SGA infants (categorical variables)

From: The prevalence and risk factors of preterm small-for-gestational-age infants: a population-based retrospective cohort study in rural Chinese population

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 3 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    
 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    
 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