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Table 2 Demographic information of the study group

From: Association between In Utero arsenic exposure, placental gene expression, and infant birth weight: a US birth cohort study

Characteristic Valuea
Number of mother-child pairs 133
Mean gestational age (wks) 39.5 (1.6)
Mean maternal age at delivery (yrs) 31.1 (4.6)
Mean parity 1.1 (1.1)
Mean pre-pregnancy BMI (kg/m2) 24.9 (4.7)
Median tap water arsenic (/g/L) 0.36 {0.02 - 3.55}
Median U-As (/g/L) 4.4 {1.8 - 11.9}
School Level  
  Less than 11th grade 3 [2.6]
  High school graduate or equivalent 10 [7.5]
  Junior college graduate or some college 28 [21.1]
   or technical school  
  College graduate 55 [41.4]
  Post-graduate schooling 18 [13.5]
  Unknown 19 [14.3]
Smoking status  
  Never 97 [72.9]
  Former 13 [9.8]
  Current 5 [3.8]
  Unknown 18 [13.5]
Mean infant birth weight (kg) 3.4 (0.4)
Infant gender  
  Male 65 [48.9]
  Female 68 [51.1]
Infant race  
  White 128 [96.2]
  Unknown 5 [3.8]
  1. aValues are presented as mean (SD), number [%], or median {interquartile range}.