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
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) |  |