Table 4.
Logistic regression analysis of smoking and sleeplessness, DMA and DD
| Sleeplessness | DMA | DD | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Univariate | Multivariable | Univariate | Multivariable | Univariate | Multivariable | |||||||
| OR (95% CI) | P-value | OR (95% CI) | P-value | OR (95% CI) | P-value | OR (95% CI) | P-value | OR (95% CI) | P-value | OR (95% CI) | P-value | |
| Smoking status | ||||||||||||
| Never | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | ||||||
| Former | 1.14 (1.13–1.16) | <0.001 | 1.10 (1.07–1.14) | <0.001* | 1.00 (0.99–1.02) | 0.745 | 1.01 (0.98–1.05) | 0.392 | 1.04 (1.03–1.06) | <0.001 | 1.05 (1.02–1.08) | 0.004* |
| Current | 1.22 (1.19–1.24) | <0.001 | 1.05 (1.00–1.10) | 0.041 | 1.00 (0.98–1.03) | 0.641 | 1.03 (0.98–1.08) | 0.269 | 1.05 (1.03–1.07) | <0.001 | 0.91 (0.86–0.96) | 0.001* |
| Cigarettes/day (current smokers) | ||||||||||||
| 0 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | ||||||
| 1–10 | 1.20 (1.15–1.24) | <0.001 | 1.07 (0.98–1.16) | 0.728 | 0.97 (0.93–1.02) | 0.273 | 0.92 (0.84–1.02) | 0.109 | 0.96 (0.92–1.00) | 0.036 | 0.87 (0.79–0.96) | 0.007* |
| 11–20 | 1.34 (1.29–1.38) | <0.001 | 1.01 (0.93–1.10) | 0.783 | 1.01 (0.97–1.05) | 0.542 | 1.11 (1.01–1.21) | 0.023 | 1.05 (1.02–1.09) | 0.003 | 0.83 (0.75–0.91) | <0.001* |
| >20 | 1.70 (1.60–1.80) | <0.001 | 1.15 (0.99–1.36) | 0.072 | 0.99 (0.92–1.06) | 0.694 | 1.04 (0.88–1.23) | 0.664 | 1.17 (1.10–1.25) | <0.001 | 0.74 (0.62–0.89) | 0.001* |
| Cigarettes/day (former smokers) | ||||||||||||
| 0 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.0.00 | ||||||
| 1–10 | 1.23 (1.20–1.27) | <0.001 | 1.14 (1.08–1.21) | <0.001* | 1.00 (0.96–1.03) | 0.768 | 0.98 (0.92–1.04) | 0.440 | 1.03 (1.00–1.06) | 0.053 | 1.08 (1.01–1.15) | 0.016* |
| 11–20 | 1.25 (1.23–1.28) | <0.001 | 1.18 (1.13–1.23) | <0.001* | 1.02 (0.99–1.04) | 0.201 | 1.02 (0.97–1.07) | 0.358 | 1.04 (1.02–1.07) | <0.001 | 0.97 (0.92–1.02) | 0.215 |
| >20 | 1.50 (1.46–1.55) | <0.001 | 1.47 (1.38–1.57) | <0.001* | 1.02 (0.99–1.06) | 0.210 | 1.03 (0.95–1.11) | 0.479 | 1.32 (1.28–1.36) | <0.001 | 1.05 (0.97–1.13) | 0.230 |
| Live with a smoker (never smokers) | ||||||||||||
| No | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | ||||||
| Yes (1) | 1.15 (1.11–1.20) | <0.001 | 1.05 (0.97–1.13) | 0.261 | 1.01 (0.97–1.06) | 0.507 | 1.10 (1.01–1.20) | 0.025 | 1.09 (1.05–1.14) | <0.001 | 1.08 (0.99–1.17) | 0.104 |
| Yes (>1) | 1.21 (1.10–1.34) | <0.001 | 1.03 (0.83–1.29) | 0.785 | 1.10 (0.98–1.24) | 0.113 | 1.17 (0.93–1.47) | 0.186 | 1.30 (1.17–1.44) | <0.001 | 1.23 (0.97–1.55) | 0.153 |
Multivariable adjusted for age, sex, ethnicity, social deprivation quintile, self-reported stress, self-reported depression, alcohol and coffee consumption, physical activity level, shift work and self-identified chronotype.
*Statistically significant results (P-value ≤0.01).