TABLE 2.
—Distributions of Predictor Variables and Unadjusted and Adjusted Odds Ratios (ORs)
| Sample, % | Unadjusted OR (CI) | Adjusted OR (CI) | |
| Social and family background | |||
| Birthplace | |||
| Chicago | 33.2 | 1.00 | 1.00 |
| South | 47.5 | 0.94 (0.81, 1.09) | 0.87 (0.74, 1.02) |
| Elsewhere | 19.3 | 1.19 (0.99, 1.42) | 1.23 (1.02, 1.49) |
| Age at first delivery, y | |||
| Younger than 25 | 82.3 | 1.00 | 1.00 |
| 25 or older | 17.7 | 2.25*** (1.95, 2.59) | 2.18*** (1.88, 2.53) |
| Household headship in 1966 | |||
| Couple | 45.0 | 1.00 | 1.00 |
| Mother alone | 39.4 | 1.07 (0.93, 1.23) | 0.92 (0.76, 1.12) |
| Other | 15.5 | 0.81 (0.66, 1.00) | 0.73 (0.58, .90) |
| Number of moves, 1961–1966 | |||
| 0 | 13.0 | 1.00 | 1.00 |
| 1 | 22.3 | 0.93 (0.75, 1.16) | 0.96 (0.77, 1.20) |
| 2 | 22.6 | 0.91 (0.73, 1.14) | 1.01 (0.80, 1.27) |
| 3 | 21.7 | 0.84 (0.67, 1.06) | 0.91 (0.72, 1.16) |
| 4 | 10.8 | 0.97 (0.75, 1.26) | 1.12 (0.84, 1.48) |
| ≥5 | 9.6 | 0.81 (0.61, 1.07) | 0.83 (0.61, 1.12) |
| Social class | |||
| Education in 1966 | |||
| Less than high school | 57.5 | 1.46** (1.27, 1.68) | 1.51** (1.30, 1.75) |
| High school or more | 42.5 | 1.00 | 1.00 |
| Household poor in 1966 | |||
| Yes | 51.5 | 1.28* (1.13, 1.46) | 1.27 (1.07, 1.51) |
| No | 48.5 | 1.00 | 1.00 |
| Household welfare receipt in 1966 | |||
| Yes | 32.5 | 1.16 (1.01, 1.34) | 0.99 (0.82, 1.20) |
| No | 67.5 | 1.00 | 1.00 |
| Health status in 1966 | |||
| Chronic condition | |||
| Yes | 89.1 | 1.38 (1.15, 1.65) | 1.21 (0.99, 1.48) |
| No | 10.9 | 1.00 | 1.00 |
| Healthy during pregnancy | |||
| Yes | 22.7 | 1.14 (0.98, 1.32) | 1.03 (0.88, 1.21) |
| No | 77.3 | 1.00 | 1.00 |
| Tense | |||
| Yes | 36.3 | 1.20 (1.05, 1.36) | 1.26 (1.08, 1.46) |
| No | 63.7 | 1.00 | 1.00 |
| Sad | |||
| Yes | 17.1 | 0.93 (0.78, 1.12) | 0.72 (0.59, 0.88) |
| No | 82.9 | 1.00 | 1.00 |
| Importance of religion | |||
| Extremely important | 29.0 | 1.22 (1.01, 1.48) | 1.19 (0.98, 1.43) |
| Very important | 47.5 | 1.17 (0.99, 1.39) | 1.15 (0.96, 1.38) |
| Not important | 24.5 | 1.00 | 1.00 |
| Social participation | |||
| Visits friends and relatives | |||
| Highest group | 26.7 | 1.00 | 1.00 |
| Middle high group | 20.3 | 1.22 (1.01, 1.48) | 1.30 (1.07, 1.57) |
| Middle low group | 33.2 | 1.05 (0.89, 1.24) | 1.09 (0.91, 131) |
| Lowest group | 19.8 | 1.15 (0.94, 1.40) | 1.17 (0.96, 1.43) |
| PTA membership | |||
| Not a member | 62.0 | 1.00 | 1.00 |
| Member, attends few meetings | 13.7 | 1.06 (0.88, 1.28) | 1.07 (0.88, 1.31) |
| Member, attends some meetings | 14.5 | 0.96 (0.79, 1.17) | 1.00 (0.81, 1.24) |
| Member, attends most meetings | 9.8 | 1.14 (0.92, 1.40) | 0.99 (0.79, 1.25) |
| Political participation | |||
| No activities | 67.8 | 1.00 | 1.00 |
| One activity | 18.9 | 0.79 (0.65, 0.96) | 0.88 (0.64, 1.20) |
| Two activities | 8.6 | 0.84 (0.71, 0.98) | 0.87 (0.73, 103) |
| Three or four activities | 4.7 | 1.40 (1.06, 1.86) | 1.48 (1.12, 1.95) |
| Voted in last election | |||
| Yes | 67.9 | 1.16 (1.01, 1.34) | 1.12 (0.86, 1.45) |
| No | 32.1 | 1.00 | 1.00 |
Note. CI = confidence interval.
*P < .05; **P < .01; ***P < .001.