Table 1.
Sample characteristics of the eligible and ineligible women in the mixed effects modeling analyses of sleep symptoms at start of study (1990-1991)
| Eligible Women (n = 286) | Ineligible Women (n = 222) | ||
|---|---|---|---|
| Characteristic | Mean (SD) | Mean (SD) | P value* |
| Age (years) | 41.4 (4.3) | 42.1 (5.0) | 0.09 |
| Years of education | 15.9 (2.8) | 15.4 (3.1) | 0.07 |
| Family income ($) | 38,800 (15,000) | 35,600 (17,400) | 0.02 |
| Characteristic | N (Percent) | N (Percent) | P value** |
| Currently employed | 0.53 | ||
| Yes | 249 (87.1) | 189 (85.1) | |
| No | 37 (12.9) | 33 (14.9) | |
| Race/ethnicity | < 0.0001 | ||
| African American | 20 (7.0) | 38 (17.1) | |
| Asian /Pacific Islander | 26 (9.1) | 17 (7.7) | |
| Caucasian | 235 (82.2) | 156 (70.3) | |
| Other (Hispanic, Mixed) | 5 (1.7) | 11 (4.9) | |
| Marital Status | 0.31 | ||
| Married/partnered | 203 (71.0) | 145 (65.3) | |
| Divorced/widowed/not partnered | 63 (22.0) | 62 (27.9) | |
| Never married/partnered | 20 (7.0) | 15 (6.8) |
*
Independent t-test;
**
Χ2 test