Table 4 Hazard ratios (95% CI) for anemia according to sleep duration stratified by age in the Kailuan Study.
From: Night Sleep Duration and Risk of Incident Anemia in a Chinese Population: A Prospective Cohort Study
Sleep duration(hours) | |||||
|---|---|---|---|---|---|
≤5 | 6.0 | 7 | 8.0 | ≥9 | |
Age < 60 | |||||
Case(incidence per 1000 person years) | 128 (4.28) | 376 (4.67) | 326 (3.73) | 1177 (4.18) | 51 (6.08) |
Model 1 | 1.27 (1.03–1.56) | 1.36 (1.17–1.58) | reference | 1.05 (0.93–1.19) | 1.43 (1.07–1.93) |
Model 2 | 1.26 (1.02–1.54) | 1.35 (1.16–1.56) | reference | 1.00 (.088–1.14) | 1.43 (1.06–1.92) |
Model 3 | 1.24 (1.01–1.53) | 1.35 (1.16–1.57) | reference | 1.02 (0.89–1.16) | 1.40 (1.04–1.90) |
Age ≥ 60 | |||||
Case(incidence per 1000 person years) | 76 (6.60) | 134 (5.89) | 105 (5.24) | 313 (6.06) | 12 (6.12) |
Model 1 | 1.17 (0.87–1.57) | 1.10 (0.85–1.42) | reference | 1.11 (0.89–1.39) | 1.04 (0.57–1.90) |
Model 2 | 1.17 (0.87–1.58) | 1.10 (0.86–1.43) | reference | 1.02 (1.81–1.29) | 1.04 (0.57–1.89) |
Model 3 | 1.16 (0.86–1.56) | 1.07 (0.83–1.39) | reference | 1.01 (0.80–1.27) | 1.04 (0.57–1.89) |
P for interaction | 0.704 | 0.633 | 0.302 | 0.579 | |
