Table 2.
Self-reported Prevalence of Insomnia Symptoms
| sample | total sample: n = 4474 | longitudinal sample: n = 832 |
||
|---|---|---|---|---|
| Sleep onset problems* | t1 | t1 | t2 | t3 |
| often | 9.8 (438) | 9.7 (81) | 6.6 (55) | 5.3 (44) |
| sometimes | 34.6 (1549) | 40.6 (338) | 42.9 (357) | 41.3 (344) |
| no | 55.6 (2487) | 49.6 (413) | 50.5 (420) | 53.4 (444) |
| Difficulties maintaining sleep | t1 | t1 | t2 | t3 |
| often | 5.8 (260) | 4.6 (38) | 3.4 (28) | 2.3 (19) |
| sometimes | 20.5 (916) | 23.1 (192) | 23.9 (199) | 21.2 (176) |
| no | 73.7 (3298) | 72.4 (602) | 72.7 (605) | 76.6 (637) |
*
Dropout and Follow-up sample significantly different at t1 (U-Test; P = 0.001)