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Table 1 Summary demographics and differences between the PROTECT study participants included in present analysis versus participants not included because of missing urine and/or serum samples

From: A repeated measures study of phenol, paraben and Triclocarban urinary biomarkers and circulating maternal hormones during gestation in the Puerto Rico PROTECT cohort

Total N Included Not Included p
602 709
Age (mean [SD]) 26.51 (5.66) 26.94 (5.34) 0.25
BMI in kg/m2 (%)
  < 25 245 (40.7) 192 (27.1) 0.99
 25–30 114 (18.9) 87 (12.3)  
  > 30 73 (12.1) 56 (7.9)  
 Missing 170 (28.2) 374 (52.8)  
Current Smoker (%)
 Never 440 (73.1) 323 (45.6) 0.03
 Ever 63 (10.5) 57 (8.0)  
 Current 23 (3.8) 6 (0.8)  
 Missing 76 (12.6) 323 (45.6)  
Exposure to Second-Hand Smoking per Day (%)
 Up to half an hour 443 (73.6) 338 (47.7) 0.16
 Up to an hour 25 (4.2) 19 (2.7)  
 More than an hour 41 (6.8) 18 (2.5)  
 Missing 93 (15.4) 334 (47.1)  
Alcohol Consumption (%)
 No 273 (45.3) 190 (26.8) 0.61
 Before pregnancy 215 (35.7) 170 (24.0)  
 Yes within the last few months 36 (6.0) 24 (3.4)  
 Missing 78 (13.0) 325 (45.8)  
Household Income in U.S. $ (%)
  < 10,000 152 (25.2) 82 (11.6) 0.03
 10,000 - 30,000 132 (21.9) 114 (16.1)  
 30,000 - 50,000 101 (16.8) 83 (11.7)  
  > 50,000 64 (10.6) 59 (8.3)  
 Missing 153 (25.4) 371 (52.3)  
Maternal Education (%)
  < High School 123 (20.4) 64 (9.0) 0.02
 Some college 194 (32.2) 137 (19.3)  
 College graduate 210 (34.9) 182 (25.7)  
 Missing 75 (12.5) 326 (46.0)  
Insurance Type (%)
 Public (Mi Salud) 318 (52.8) 340 (48.0) 0.001
 Private 222 (36.9) 153 (21.6)  
 Missing 62 (10.3) 216 (30.5)