| Variables | Depressive symptoms | P –value | |
| Yes n=173(43.5%) |
No n=225(56.5%) |
||
| Subjective sleep quality (Component 1) | - | - | .0001 |
| Very good | 41(23.7%) | 129(57.3%) | - |
| fairly good | 96(55.5%) | 86(38.2%) | - |
| fairly bad | 19(11.0%) | 8(3.6%) | - |
| very bad | 17(9.8%) | 2(0.9%) | - |
| Sleep latency (Component 2) | - | - | .0001 |
| 0(<15 minutes) | 33(19.1%) | 120(53.3%) | - |
| 1(16-30minutes) | 9(5.2%) | 21(9.3%) | - |
| 2(31-60 minutes) | 45(26.0%) | 43(19.1%) | - |
| 3(>60minuntes) | 86(49.7%) | 41(18.2%) | - |
| sleep duration (Component 3) | - | - | .0001 |
| >7 hours | 38(22.0%) | 72(32.0%) | - |
| 6-7hours | 25(14.5%) | 69(30.7%) | - |
| 5-6 hours | 61(35.3%) | 61(27.1%) | - |
| <5 hours | 49(28.3%) | 23(10.2%) | - |
| Habitual sleep efficiency (Component 4) | - | - | 0.0001 |
| >85% (very good) | 43(24.9%) | 97(43.1%) | - |
| 75%-84% (fairly good ) | 31(17.9%) | 57(25.3%) | - |
| 65%-74% (fairly bad) | 29(16.8%) | 40(17.8%) | - |
| <65 % (very bad) | 70(40.5%) | 31(13.8%) | - |
| Sleep disturbances (Component 5) | - | - | 0.0001 |
| 0 (very good) | 36(20.8%) | 132(58.7%) | - |
| 1-9( fairly good) | 67(38.7%) | 46(20.4%) | - |
| 10-18 (fairly bad) | 51(29.5%) | 29(12.9%) | - |
| 19-27( very bad) | 19(11.0%) | 18(8.0%) | - |
| use of sleep medicine (Component 6) | - | - | .459 |
| not at all | 157(90.8%) | 211(93.8%) | - |
| less than once a week | 6(3.5%) | 4(1.8%) | - |
| once or twice a week | 10(5.8%) | 10(4.4%) | - |
| Daytime dysfunction (Component 7) | - | - | .0001 |
| 0(Very good) | 122(70.5%) | 198(88.0%) | - |
| 1(Fairly good) | 28(16.2%) | 14(6.2%) | - |
| 2(Fairly bad) | 22(12.7%) | 13(5.8%) | - |
| 3(Very bad) | 1(0.6%) | 0(0.0%) | - |