Table 3.
Associations between mental intensity and sleep quality among 656 participants recruited from a US university
| N | Sleep Quality Score Unadjusted beta (95% CI) |
Sleep Quality Score Adjusted beta1 (95% CI) |
Sleep Quality Score>5 Adjusted Prevalence Ratio (95% CI) |
|
|---|---|---|---|---|
| Hours spent in mental work on school days | ||||
| Q1 (1 to 4 hrs per day) | 210 | Reference | Reference | Reference |
| Q2 (4.5 to 5.5 hrs per day) | 193 | 0.27 (−0.27, 0.82) | 0.18 (−0.36, 0.72) | 1.17 (0.94, 1.45) |
| Q3 (6 to 8 hrs per day) | 164 | 0.32 (−0.24, 0.89) | 0.13 (−0.45, 0.70) | 1.22 (0.98, 1.53) |
| Q4 (9 to 15 hrs per day) | 132 | 0.51 (−0.10, 1.12) | 0.38 (−0.24, 0.99) | 1.28 (1.02, 1.62) |
| P, trend | 0.10 | 0.29 | 0.03 | |
| Mental intensity on school days | ||||
| Q1 (8 to 60) | 182 | Reference | Reference | Reference |
| Q2 (63 to 96) | 180 | 0.49 (−0.08, 1.06) | 0.43 (−0.15, 1.00) | 1.23 (0.97, 1.57) |
| Q3 (100 to 140) | 194 | 0.48 (−0.08, 1.03) | 0.33 (−0.24, 0.90) | 1.29 (1.02, 1.62) |
| Q4 (144 to 420) | 143 | 0.87 (0.27, 1.48) | 0.72 (0.11, 1.34) | 1.45 (1.15, 1.83) |
| P, trend | 0.008 | 0.04 | 0.002 |
1
Includes adjustment for sex, age, race, weekly servings of caffeinated beverage intake, and weekly METS of moderate physical activity