Table 2.
Mean (SD) bedtime and sleep quality information for all survivors and for survivors with no, moderate, or severe fatigue separately.
| Total (N = 458) |
No Fatigue (n = 134) |
Moderate Fatigue (n = 171) |
Severe Fatigue (n = 133) |
p Value | Post Hoc Comparison | Missing (%) | |
|---|---|---|---|---|---|---|---|
| Bed timea | |||||||
| Basic variables | |||||||
| I go to bed at . . . o’clock | 23:03 (0:59) | 23:23 (0:59) | 22:59 (0:58) | 22:48 (0:57) | <0.001* | N > M, S | 0.9 |
| I get ready to fall asleep at . . . o’clock | 23:25 (0:55) | 23:37 (0:56) | 23:26 (0:50) | 23:14 (0:57) | 0.004* | N > S | 1.1 |
| I need . . . minutes to fall asleepb | 17 (22) | 11 (13) | 17 (19) | 24 (31) | <0.001* | N, M < S | 1.7 |
| I wake up at . . . o’clockb | 7:43 (1:25) | 7:49 (1:10) | 7:39 (1:24) | 7:45 (1:36) | 0.86 | 1.5 | |
| After . . . minutes I get up | 32 (56) | 22 (32) | 33 (51) | 39 (60) | 0.006 | 2.6 | |
| Hours spent outsideb | 2:38 (1:49) | 3:17 (2:14) | 2:20 (1:29) | 2:17 (1:34) | <0.001* | N > M, S | 10.9 |
| Calculated variables | |||||||
| Sleep onset | 23:42 (0:59) | 23:48 (0:59) | 23:43 (0:54) | 23:36 (1:06) | 0.29 | 1.3 | |
| Sleep durationb | 8:00 (1:28) | 8:01 (1:07) | 7:55 (1:32) | 8:09 (1:41) | 0.05 | 2.0 | |
| Total time in bed | 9:10 (1:18) | 8:48 (1:03) | 9:12 (1:21) | 9:35 (1:21) | <0.001* | N < M < S | 1.7 |
| Average midsleep | 3:19 (0:51) | 3:18 (0:48) | 3:19 (0:47) | 3:22 (0:58) | 0.76 | 3.3 | |
| Moderate/extreme early, n (%)c | 21 (5) | 4 (3) | 7 (4) | 9 (7) | 0.74 | 3.3 | |
| Slightly early, n (%) | 124 (27) | 42 (32) | 44 (27) | 31 (24) | |||
| Intermediate, n (%) | 211 (46) | 64 (48) | 78 (48) | 62 (48) | |||
| Slightly late, n (%) | 75 (16) | 20 (15) | 30 (19) | 23 (18) | |||
| Moderate/extreme late, n (%) | 12 (3) | 3 (2) | 3 (2) | 5 (4) | |||
| Social jetlag | 0:44 (0:43) | 0:51 (0:45) | 0:41 (0:41) | 0:40 (0:44) | 0.06 | 2.2 | |
| Sleep qualitya | |||||||
| Subjective sleep qualityb | 1.1 (0.7) | 0.6 (0.6) | 1.2 (0.6) | 1.4 (0.8) | <0.001* | N < M < S | 0.4 |
| Sleep latency | 1.0 (0.9) | 0.5 (0.8) | 1.0 (0.9) | 1.3 (1.0) | <0.001* | N < M < S | 1.7 |
| Sleep duration | 0.4 (0.8) | 0.5 (0.8) | 0.4 (0.8) | 0.4 (0.8) | 0.51 | 2.0 | |
| Sleep efficiencyb | 0.4 (0.7) | 0.1 (0.4) | 0.5 (0.9) | 0.4 (0.8) | <0.001* | N < M, S | 2.0 |
| Sleep disruptionsb | 1.3 (0.6) | 1.1 (0.5) | 1.3 (0.5) | 1.5 (0.7) | <0.001* | N < M < S | 6.8 |
| Sleep medicationb | 0.3 (0.8) | 0.1 (0.4) | 0.3 (0.8) | 0.4 (0.9) | <0.001* | N < M, S | 0 |
| Daily dysfunctioningb | 1.1 (0.8) | 0.4 (0.6) | 1.2 (0.7) | 1.6 (0.8) | <0.001* | N < M < S | 0.9 |
| Total scoreb | 5.4 (3.3) | 3.4 (2.2) | 5.8 (3.2) | 6.8 (3.4) | <0.001* | N < M < S | 9.0 |
Abbreviations: N = no fatigue; M = moderate fatigue; S = severe fatigue. The 24-h clock notation is used for questions regarding time (22:30 is half past 2200 h) and duration (0:30 is 30 min, that is, 0.5 h).
a.
Bonferroni corrected p value of 0.004 (0.05/12) or less was considered to be statistically significant for bedtime variables. A Bonferroni corrected p value of 0.006 (0.05/8) or less was considered to be statistically significant for sleep quality variables.
b.
Kruskal-Wallis test reported.
c.
Fisher’s Exact Test reported.
*
p < 0.004 for bedtime variables or p < 0.006 for sleep quality variables.