Table 3. Unadjusted and adjusted mean PSQI overall and subscale scores by tertiles of Spielberger stress components.
| Global PSQI | Sleep Duration | Sleep Latency | Sleep Disturbances | ||||||
|---|---|---|---|---|---|---|---|---|---|
|
|
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| N | Unadjusted Mean (SD) | MV- Adjusted* Mean (SE) | Unadjusted Mean (SE) | MV- Adjusted* Mean (SE) | Stress Index In Past Year (Tertiles) | MV- Adjusted* Mean (SE) | Unadjusted Mean (SD) | MV- Adjusted* Mean (SE) | |
| Total | |||||||||
| Low | 118 | 5.8 (3.2) | 5.7 (0.3) | 6.2 (1.2) | 6.3 (0.1) | 21.6 (17.5) | 21.5 (1.7) | 6.2 (4.2) | 6.1 (0.4) |
| Middle | 119 | 6.4 (3.4) | 6.4 (0.3) | 6.2 (1.3) | 6.1 (0.1) | 22.3 (15.8) | 22.2 (1.6) | 7.5 (4.8) | 7.4 (0.4) |
| High | 119 | 7.4 (3.3) | 7.3 (0.3) | 6.0 (1.1) | 6.0 (0.1) | 25.7 (18.1) | 25.6 (1.6) | 8.6 (4.8) | 8.6 (0.4) |
| p-value** | <0.001 | <0.001 | 0.26 | 0.11 | 0.034 | 0.043 | <0.001 | <0.001 | |
| Admin/Org Pressure | |||||||||
| Low | 118 | 5.9 (3.4) | 5.9 (0.3) | 6.2 (1.2) | 6.2 (0.1) | 22.9 (19.0) | 23.0 (1.7) | 6.4 (4.2) | 6.3 (0.4) |
| Middle | 119 | 6.4 (3.3) | 6.4 (0.3) | 6.2 (1.2) | 6.1 (0.1) | 20.8 (13.8) | 20.7 (1.6) | 7.3 (4.9) | 7.2 (0.4) |
| High | 119 | 7.2 (3.3) | 7.2 (0.3) | 6.1 (1.1) | 6.0 (0.1) | 26.0 (18.2) | 25.6 (1.6) | 8.5 (4.7) | 8.6 (0.4) |
| p-value** | 0.003 | 0.004 | 0.63 | 0.37 | 0.05 | 0.09 | <0.001 | <0.001 | |
| Phys/Psych Danger | |||||||||
| Low | 118 | 6.2 (3.3) | 6.1 (0.3) | 6.2 (1.3) | 6.3 (0.1) | 22.9 (17.5) | 22.6 (1.6) | 6.8 (4.5) | 6.7 (0.4) |
| Middle | 119 | 6.2 (3.4) | 6.2 (0.3) | 6.2 (1.1) | 6.1 (0.1) | 21.3 (15.7) | 21.6 (1.6) | 7.0 (4.4) | 6.9 (0.4) |
| High | 119 | 7.2 (3.3) | 7.1 (0.3) | 6.0 (1.2) | 6.0 (0.1) | 25.4 (18.3) | 25.2 (1.6) | 8.5 (5.0) | 8.5 (0.4) |
| p-value** | 0.003 | 0.004 | 0.15 | 0.05 | 0.13 | 0.16 | 0.002 | 0.001 | |
| Lack of Support | |||||||||
| Low | 118 | 5.4 (2.9) | 5.3 (0.3) | 6.3 (1.2) | 6.3 (0.1) | 20.2 (16.1) | 19.6 (1.6) | 5.6 (3.9) | 5.5 (0.4) |
| Middle | 119 | 6.9 (3.5) | 6.9 (0.3) | 6.0 (1.2) | 5.9 (0.1) | 25.2 (19.1) | 25.3 (1.6) | 7.6 (4.6) | 7.6 (0.4) |
| High | 119 | 7.2 (3.3) | 7.2 (0.3) | 6.1 (1.2) | 6.1 (0.1) | 24.2 (16.1) | 24.5 (1.6) | 9.1 (4.9) | 9.0 (0.4) |
| p-value** | <0.001 | <0.001 | 0.15 | 0.11 | 0.007 | 0.005 | <0.001 | <0.001 | |
Note: PSQI = Pittsburgh Sleep Quality Index; Admin/Org Pressure=administrative/organizational pressure; Phys/Psych Danger= physical/psychological danger
*
Models adjusted for age, gender, race, education, marital status, and smoking status. Those taking sleep medication were included.
**
p-values are from linear regression.