Risk factors independently associated with mortality at p<0.0001 and the amount of confounding of these risk factors with frequent hypnotic use
| Risk factor | HR | χ2 | Correlation with hypnotic use | Confounding score for hypnotic use |
|---|---|---|---|---|
| Age (10 years) | 2.31 | 2343.5 | 0.007 | 0.44 |
| Smoking* | 1.38 | 1539.8 | 0.050 | 2.17 |
| Diabetes treatment | 1.99 | 357.1 | 0.021 | 0.73 |
| Physical function* | 0.82 | 332.5 | −0.137 | 7.48 |
| General health | 0.99 | 112.0 | −0.134 | 5.15 |
| Coronary bypass surgery | 1.92 | 102.6 | 0.014 | 0.33 |
| Systolic blood pressure | 1.12 | 60.3 | 0.014 | 0.39 |
| Income* | 0.92 | 48.6 | −0.036 | 0.68 |
| Loss of appetite | 1.19 | 48.6 | 0.052 | 0.98 |
| Alcohol * | 0.94 | 25.6 | −0.001 | 0.01 |
| WHI dataset (3 df) | 51.6 | |||
| US region (3 df) | 44.2 |
*The HR was computed for an increase in the variable of 1 SD.
HR, hazard ratio; 3df, a variable with four categories has three degrees of freedom in the Cox model; WHI, Women's Health Initiative.