Table 3.
Association between Pittsburgh Sleep Quality Index (PSQI) sleep scores at baseline and successful weight loss at 6 months (n = 245)
| Sleep score at baseline | Unsuccessfula weight loss | Successfula weight loss | Crude | Adjustedb |
|---|---|---|---|---|
|
| ||||
| n (%) | RR (95% CI) | |||
| Subjective sleep quality | 0.65 (0.50–0.86) | 0.67 (0.52–0.86) | ||
| 0: Very good | 31 (22.6) | 43 (39.8) | ||
| 1–3: Not very good | 106 (77.4) | 65 (60.2) | ||
| Sleep latency score | 0.87 (0.66–1.15) | 0.86 (0.67–1.12) | ||
| 0: No difficulty | 55 (40.2) | 50 (46.3) | ||
| 1–3: Some difficulty | 82 (59.9) | 58 (53.7) | ||
| Sleep duration | 0.71 (0.54–0.94) | 0.70 (0.54–0.91) | ||
| 0: >7 h | 41 (29.9) | 48 (44.4) | ||
| 1–3:≤7 h | 96 (70.1) | 60 (55.6) | ||
| Habitual sleep efficiency | 0.80 (0.57–1.12) | 0.78 (0.55–1.10) | ||
| 0: >85% | 92 (67.2) | 81 (75.0) | ||
| 1–3: ≤85% | 45 (32.9) | 27 (25.0) | ||
| Sleep disturbances | 1.02 (0.73–1.42) | 0.98 (0.71–1.36) | ||
| 0–1: None/few | 106 (77.4) | 83 (76.9) | ||
| 2–3: Some | 31 (22.6) | 25 (23.2) | ||
| Sleeping medication use | 0.60 (0.38–0.94) | 0.61 (0.40–0.93) | ||
| 0: None | 100 (73.0) | 93 (86.1) | ||
| 1–3: Some | 37 (27.0) | 15 (13.9) | ||
| Daytime dysfunction | 1.07 (0.80–1.43) | 1.03 (0.79–1.36) | ||
| 0: None | 56 (40.9) | 41 (38.0) | ||
| 1–3: Some | 81 (59.1) | 67 (62.0) | ||
| Global Sleep Score | 0.80 (0.61–1.07) | 0.79 (0.60–1.02) | ||
| 0–4: Good sleep | 59 (43.1) | 57 (52.8) | ||
| 5–21: Poor sleep | 78 (56.9) | 51 (47.2) | ||
CI, confidence interval; RR, relative risk.
a
Unsuccessful weight loss defined as losing <10% baseline body weight between baseline and 6 months; successful weight loss defined as losing ≥10% baseline body weight between baseline and 6 months.
b
Adjusted for age, BMI, race/ethnicity, and intervention arm.