TABLE 1.
Baseline study population characteristics among women with newborn DNA methylation data
| Self-report caffeinated beverage, any intake | Preconception caffeine tertile | ||||
|---|---|---|---|---|---|
| Characteristic1 | Analytic sample | 1 | 2 | 3 | |
| ≤0.08 µg/mL | 0.08–0.56 µg/mL | >0.56 µg/mL | |||
| n | 378 | 250 | 125 | 119 | 119 |
| Age, years, mean (SD) | 28.3 (4.5) | 28.5 (4.6) | 27.5 (3.9) | 27.9 (4.3) | 29.8 (4.8) |
| Prepregnancy BMI, kg/m2, mean (SD) | 25.2 (5.5) | 25.5 (5.8) | 24.6 (5.1) | 25.2 (5.5) | 25.4 (5.2) |
| Education, >high school | 3387 (89.4) | 221 (88.4) | 115 (92.0) | 106 (89.1) | 105 (88.2) |
| Household income, ≥$40k | 260 (68.8) | 178 (71.2) | 74 (59.2) | 90 (75.6) | 88 (73.9) |
| Smoking status, never | 348 (92.1) | 227 (90.8) | 124 (99.2) | 109 (91.6) | 102 (85.0) |
| Preconception alcohol, any | 90 (27.3) | 84 (33.6) | 7 (6.4) | 28 (25.2) | 50 (52.1) |
1
All values are n (%) unless otherwise stated.