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Table 1 Distribution of demographic variables among mothers/infants in HOME study

From: A prospective cohort study of biomarkers of prenatal tobacco smoke exposure: the correlation between serum and meconium and their association with infant birth weight

Variable All Women
N = 389 (%)
Women with All Data N = 315 (%) * Women Missing Any Data N = 74 (%)
Maternal Race    
   White 237 (61.7) 209 (66.4) 28 (40.6)
   Black 121 (31.5) 86 (27.3) 35 (50.7)
   Other 26 (6.8) 20 (6.3) 6 (8.7)
   Missing 5 0 5
Maternal Education (years)    
   < 12 41 (10.7) 23 (7.3) 18 (26.1)
   12 54 (13.8) 41 (13.0) 13 (18.8)
   > 12 289 (74.5) 251 (79.7) 38 (55.1)
   Missing 5 0 5
Marital Status    
   Married 248 (64.6) 217 (68.9) 31 (44.9)
   Single 136 (35.4) 98 (31.1) 38 (55.1)
   Missing 5 0 5
Maternal Age Category (years)    
   < 25 96 (24.7) 63 (20.0) 33 (44.6)
   25-34 231 (59.4) 197 (62.5) 34 (45.9)
   35+ 62 (15.9) 55 (17.5) 7 (9.5)
   Missing 0 0 0
  1. *Women had all 3 serum cotinine measurements, both self-reported tobacco smoke interviews, meconium measurement, and infant birth outcome data.