Table I.
Cohort characteristics by observed pregnancy status, LIFE Study (2005–2009)a.
| Characteristic | Pregnant (n = 347) | Not pregnant (n = 54) | Withdrew (n = 100) |
|---|---|---|---|
| Mean ± SD | Mean ± SD | Mean ± SD | |
| Female age (years) | 29.8 ± 3.9 | 30.6 ± 4.3 | 30.3 ± 4.8 |
| Male age (years) | 31.6 ± 4.6 | 32.4 ± 5.3 | 32.1 ± 5.8 |
| Female BMI (kg/m2) | 27.0 ± 6.7 | 28.7 ± 9.1 | 29.4 ± 7.9 |
| Male BMI (kg/m2) | 29.7 ± 5.5 | 30.3 ± 5.5 | 29.9 ± 5.8 |
| Gravidity (# pregnancies) | 1.1 ± 1.2 | 0.8 ± 1.3 | 1.3 ± 1.5 |
| Parity (# live births)*** | 0.7 ± 0.8 | 0.2 ± 0.5 | 0.7 ± 1.0 |
| n (%) | n (%) | n (%) | |
| Female race/ethnicity | |||
| Non-Hispanic white | 285 (82) | 39 (72) | 66 (66) |
| Non-Hispanic black | 5 (1) | 4 (7) | 13 (13) |
| Hispanic | 29 (8) | 8 (15) | 13 (13) |
| Other | 28 (8) | 3 (6) | 7 (7) |
| Male race/ethnicity | |||
| Non-Hispanic white | 278 (80) | 42 (78) | 64 (64) |
| Non-Hispanic black | 7 (2) | 4 (7) | 12 (12) |
| Hispanic | 30 (9) | 6 (11) | 12 (12) |
| Other | 10 (3) | — | 3 (3) |
| Female smoking** | |||
| No | 308 (92) | 45 (79) | 78 (80) |
| Yes | 58 (12) | 12 (21) | 19 (20) |
| Male smoking** | |||
| No | 282 (83) | 43 (75) | 62 (65) |
| Yes | 58 (17) | 14 (25) | 34 (35) |
| Household income | |||
| <70 000 | 91 (27) | 24 (44) | 44 (44) |
| ⩾70 000 | 250 (73) | 30 (56) | 55 (55) |
*P < .001; **P < 0.0001.
aMissing data are not reflected in the table.