Table 2 Presenting prevalence of baseline sleep problems and fatigue. Cross tabulation of baseline sleep problems and CWP at respective follow-up. Differences between no CWP and CWP cases in respective year for follow-up have been tested with chi2-test
|  | 5-year follow-up(N = 1249) | 18-year follow-up (N = 791) | ||||
|---|---|---|---|---|---|---|
No CWP | CWP | p | No CWP | CWP | p | |
N = 1160 | N = 89 | N = 688 | N = 103 | |||
Initiating sleep; n (%) | < 0.01 |  |  | < 0.01 | ||
 No Problem | 950 (95) | 53 (5) |  | 580 (89) | 70 (11) |  |
 Problem | 198 (85) | 34 (15) |  | 103 (76) | 32 (24) |  |
Maintaining sleep; n (%) | < 0.01 |  |  | < 0.01 | ||
 No Problem | 811 (95) | 41 (5) |  | 500 (91) | 52 (9) |  |
 Problem | 330 (88) | 46 (12) |  | 183 (78) | 50 (22) |  |
Early awakening; n (%) | < 0.01 |  |  | < 0.01 | ||
 No Problem | 909 (95) | 49 (5) |  | 556 (89) | 70 (11) |  |
 Problem | 228 (86) | 37 (14) |  | 124 (80) | 32 (20) |  |
Non restorative sleep; n (%) | < 0.01 |  |  | < 0.01 | ||
 No Problem | 856 (95) | 42 (5) |  | 525 (90) | 56 (10) |  |
 Problem | 283 (87) | 44 (13) |  | 159 (78) | 45 (22) |  |
Fatigue; n (%) |  | < 0.01 |  |  | < 0.01 | |
 Low | 455 (97) | 14 (3) |  | 285 (91) | 27 (9) |  |
 Intermediate | 355 (94) | 21 (6) |  | 230 (90) | 26 (10) |  |
 High | 346 (87) | 53 (13) |  | 173 (78) | 50 (22) |  |