Table 2.
Baseline scores on outcomes of interest by group (N=1029).
| Measurea | Waitlist (n=444) | Calm (n=585) | t test (df) | P value | ||
|
|
Values, n (%) | Values, mean (SD) | Values, n (%) | Values, mean (SD) |
|
|
| ISIb | 444 (100) | 11.90 (5.87) | 584 (99.8) | 11.45 (5.65) | 1.22 (1027) | .22 |
| ESSc | 443 (99.8) | 7.10 (4.61) | 582 (99.5) | 7.26 (4.92) | 0.51 (1024) | .61 |
| WPAId: absenteeism | 415 (93.5) | 0.23 (0.42) | 559 (95.6) | 0.19 (0.39) | 1.77 (973) | .18 |
| WPAI: presenteeism | 406 (91.4) | 30.62 (26.14) | 547 (93.5) | 28.10 (25.69) | 1.48 (953) | .14 |
| WPAI: overall work impairment | 404 (91) | 33.08 (28.44) | 546 (93.3) | 30.30 (27.93) | 1.50 (949) | .13 |
| WPAI: activity impairment | 438 (98.6) | 35.87 (28.70) | 574 (98.1) | 32.33 (27.16) | 1.99e (1011) | .047e |
aAll measures were assessed continuously, except for absenteeism, which was coded as a dichotomous variable (0=any health-related absence and 1=no absence).
bISI: Insomnia Severity Index.
cESS: Epworth Sleepiness Scale.
dWPAI: Work Productivity and Activity Impairment.
eSignificant differences from group comparisons.