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Table 1 Demographic characteristics of Chemicals in Our Body (CIOB) study population (N = 506)

From: Associations between prenatal maternal exposure to per- and polyfluoroalkyl substances (PFAS) and polybrominated diphenyl ethers (PBDEs) and birth outcomes among pregnant women in San Francisco

  N (%)
Maternal Age
 Mean (SD) 32 (5.4)
Maternal Race/Ethnicity
 Non-Hispanic White 193 (38%)
 Non-Hispanic Black 40 (8%)
 Hispanic 173 (34%)
 Asian/Pacific Islander 95 (19%)
Missing 5 (1%)
Pre-pregnancy Body Mass Index
 Underweight (< 18.5 kg/m2) 12 (2%)
 Normal (18.5–24.9 kg/m2) 236 (47%)
 Overweight (25–29.9 kg/m2) 128 (25%)
 Obese (≥  30 kg/m2) 89 (18%)
Missing 41 (8%)
Infant Sex
 Female 257 (51%)
Missing 27 (5.3%)
Parity
 One or More Previous Births 254 (50%)
Missing 7 (1%)
Maternal Education
  < High School 59 (12%)
 High School Graduate or Some College 139 (27%)
 College Degree 116 (23%)
 Graduate Level Degree 185 (37%)
Missing 7 (1%)
Smoking Status
 Never 421 (83%)
 Ever 60 (12%)
 Current 10 (2%)
Missing 15 (3%)
Difficulty Paying for Basics
 Yes 146 (29%)
Missing 12 (2%)
Food Insecurity
 Yes 79 (16%)
Foreign Born
 Yes 209 (41%)
Missing 75 (15%)
Preterm Birth
  < 37 weeks gestation 41 (8%)
Missing 13 (3%)
  Median (SD)
Birth Weight (grams) 3300 (580)
Missing 18 (4%)
Gestational Age at Delivery (weeks) 39 (2.0)
Missing 13 (3%)
  1. Note: percentages may not sum to 100 due to rounding
  2. Abbreviations: SD standard deviation