Table 3.
Between-participants comparisons between the final sample and the excluded sample on baseline measures
| Excluded (N = 2039) | Included (N = 1248) | ||||
|---|---|---|---|---|---|
| Variable | Mean or % | SD | Mean or % | SD | p* |
| Age (years) | 52.2 | 11.6 | 53.2 | 11.0 | 0.02 |
| BMI (kg/m2) | 29.6 | 7.6 | 28.9 | 7.4 | <0.01 |
| AUDIT | 9.0 | 3.6 | 8.9 | 3.6 | 0.52 |
| DBAS-16 | 43.1 | 19.0 | 38.6 | 17.9 | <0.001 |
| PSS | 14.0 | 6.1 | 12.4 | 5.6 | <0.001 |
| % Education (>HS) | 86.4 | 87.9 | 0.24 | ||
| % Female | 75.8 | 67.4 | <0.001 | ||
| % Income (≥$30,000) | 75.0 | 77.8 | 0.07 | ||
| % Ethnic minority | 23.1 | 17.5 | <0.001 | ||
| % PHQ-9 ≥ 5 | 25.2 | 15.2 | <0.001 | ||
| Variable | Median | Min, Max | Median | Min, Max | p† |
| DHS | 27.0 | 0, 310 | 20.0 | 0, 296 | <0.001 |
| FIRST | 18.0 | 9, 36 | 16.0 | 9, 36 | <0.001 |
| SAMI | 21.0 | 11, 55 | 19.0 | 11, 55 | <0.001 |
| SPS | 24.0 | 10, 64 | 21.0 | 10, 63 | <0.001 |
| ESS | 6.0 | 0, 24 | 6.0 | 0, 24 | <0.001 |
AUDIT = Alcohol Use Disorders Identification Test, BMI = body mass index, DBAS-16 = Dysfunctional Beliefs and Attitudes about Sleep Scale, DHS = Daily Hassles Scale, ESS = Epworth Sleepiness Scale, FIRST = Ford Insomnia Response to Stress Test, PHQ-9 = Patient Health Questionnaire, PSS = Perceived Stress Scale, SAMI = Sleep Associated Monitoring Index, SPS = Sleep Preoccupation Scale.
*ANOVA (or Fisher’s exact) p-value from test of equal means (or %) across groups. †All of the variables arrayed above as median values were arrayed in this manner owing to skewed distributions with p-values from Kruskal–Wallis test.