Table 2.
Changes in sleep disturbance and daytime impairment
| Baseline M (SD) | Follow-up M (SD) | Change M (SD) | ||
|---|---|---|---|---|
|
|
||||
| Sleep onset latency (minutes) | F = 2.4; p = .09; partial η2 = .01 | |||
| Asymptomatic Remitters | 33.8 (26.7) | 17.5 (8.9) | − 16.3 (26.9) | |
| Symptomatic Remitters | 62.2 (49.8) | 56.9 (48.2) | − 5.3 (50.5)a | |
| Chronic Insomniacs | 64.3 (49.9) | 58.5 (45.3) | − 5.8 (43.0)a | |
| Wake Time After Sleep Onset (minutes) | F = 3.2; p < .05; partial η2 = .01 | |||
| Asymptomatic Remitters | 44.2 (50.6) | 15.8 (9.9) | − 28.5 (49.6) | |
| Symptomatic Remitters | 93.7 (74.2) | 82.6 (67.7) | − 11.1 (70.2) | |
| Chronic Insomniacs | 93.5 (71.2) | 86.6 (74.0) | − 7.0 (79.3)a | |
| Total sleep time (minutes) | F = 7.7; p < .01; partial η2 = .02 | |||
| Asymptomatic Remitters | 351.0 (71.7) | 383.9 (71.7) | + 32.9 (61.9)b,c | |
| Symptomatic Remitters | 340.6 (86.3) | 357.2 (75.1) | + 16.5 (75.4)a,c | |
| Chronic Insomniacs | 328.2 (77.4) | 329.9 (78.5) | + 1.8 (74.2)a,b | |
| Daytime Impairment | F = 12.3; p < .01; partial η2 = .04 | |||
| Asymptomatic Remitters | 29.5 (7.2) | 25.7 (7.7) | − 3.8 (5.0) | |
| Symptomatic Remitters | 32.0 (7.0) | 28.9 (7.0) | − 3.1 (5.4) | |
| Chronic Insomniacs | 38.3 (8.4) | 37.4 (9.4) | − 0.9 (5.6)a | |
| Epworth Sleepiness Scale | F = 1.1; p = .34; partial η2 = .00 | |||
| Asymptomatic Remitters | 8.6 (4.3) | 7.9 (4.2) | − 0.7 (2.6) | |
| Symptomatic Remitters | 8.1 (4.3) | 7.6 (4.0) | − 0.5 (3.4) | |
| Chronic Insomniacs | 8.9 (4.7) | 8.7 (4.7) | − 0.2 (3.5) | |
| Number of hours worked: | F = 3.2; p < .05; partial η2 = .01 | |||
| Asymptomatic Remitters | 30.8 (21.0) | 35.9 (29.9) | + 5.2 (30.0) | |
| Symptomatic Remitters | 30.2 (26.4) | 27.4 (22.8) | − 2.8 (24.6)a | |
| Chronic Insomniacs | 26.8 (23.6) | 27.1 (22.6) | + 0.3 (23.2) | |
a
significantly different from the ‘Asymptomatic Remitters’ group;
b
significantly different from the ‘Symptomatic Remitters’ group,
c
significantly different from the ‘Chronic Insomniacs’ group; SD, Standard deviation.