Table 4.
Quality of life by sleep quality at baseline (n = 95)
| Mean (SD) | Difference (good – poor sleep) | ||||
|---|---|---|---|---|---|
|
|
|||||
| Good sleep quality (global PSQI ≤5) (n = 37) |
Poor sleep quality (global PSQI >5) (n = 58) |
Meana (SDb) | 95% CIc | p valued | |
| PSS scoree | 19.0 (8.3) | 24.1 (6.8) | −5.15 (7.38) | (−8.39, −1.90) | 0.002 |
| SF-36 component scoresf | |||||
| Physical | 50.4 (9.7) | 46.6 (10.2) | 3.75 (10.02) | (−0.45, 7.94) | 0.079 |
| Mental | 53.8 (9.6) | 46.9 (11.6) | 6.90 (10.85) | (2.50, 11.31) | 0.003 |
| SF-36 subscale scoresg | |||||
| Physical functioning | 77.8 (21.1) | 72.5 (22.2) | 5.34 (21.74) | (−3.66, 14.34) | 0.241 |
| Vitality | 65.0 (18.0) | 48.0 (18.8) | 17.02 (18.50) | (9.31, 24.72) | <0.001 |
| Role limitations caused by physical problems | 77.0 (33.5) | 64.2 (38.6) | 12.80 (36.75) | (−2.10, 27.70) | 0.091 |
| Bodily pain | 78.2 (20.0) | 65.2 (22.3) | 13.04 (21.37) | (4.32, 21.75) | 0.004 |
| General health | 75.8 (16.8) | 63.2 (21.7) | 12.61 (20.00) | (4.65, 20.56) | 0.002 |
| Social functioning | 90.5 (15.1) | 79.1 (23.2) | 11.45 (20.48) | (3.63, 19.26) | 0.005 |
| Role limitations caused by emotional problems | 87.4 (27.6) | 66.7 (41.9) | 20.72 (37.02) | (6.56, 34.88) | 0.005 |
| Mental health | 81.6 (14.8) | 71.4 (15.5) | 10.18 (15.27) | (3.83, 16.53) | 0.002 |
PSS: Perceived Stress Scale; SF-36: 36-item Short Form Survey.
a
Difference in the mean baseline score between individuals with good sleep quality compared to poor.
b
Pooled standard deviation for the difference in the mean baseline score between individuals with good sleep quality compared to poor.
c
95% confidence interval for the difference between the two means assuming unequal variances.
d
Welch’s two-sample t-test was performed assuming unequal variances.
e
Higher PSS indicates greater stress.
f
Higher scores for the SF-36 subscales indicate better quality of life.