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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
| 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) | |
