Cox Proportional Hazards Model
| Independent Variables | Hazard Ratio (95% CI) | P |
|---|---|---|
| Confidant | NA | .194 |
| Age at study onset | 1.00 (0.96–1.04) | .91 |
| Sex | 2.35 (1.75–3.16) | <.0001 |
| BMI | 0.95 (0.93–0.98) | .0001 |
| Income | ||
| Lowest | 1.08 (0.73–1.59) | .71 |
| Intermediate | 1.27 (0.95–1.70) | .10 |
| Education | ||
| Lowest | 0.82 (0.59–1.15) | .25 |
| Intermediate | 0.82 (0.63–1.07) | .15 |
| Morbidity index | 1.19 (1.07–1.31) | .0008 |
| Race category | 1.08 (0.77–1.52) | .69 |
| Married | NA | .0006 |
| Functional status | NA | .078 |
| Physical function | 0.98 (0.97–0.98) | <.0001 |
| Bodily pain score | 1.01 (1.00–1.01) | .0009 |
| Age*survival term | 1.01 (1.01–1.02) | <.0001 |
| Confidant*married | NA | .89 |
| FuncStatus*married | NA | .50 |
| FuncStatus*Confidant | NA | .026 |
↵* Survival is time-linked to age and thus this interaction term has an associated hazard ratio and confidence interval. Hazard ratios and confidence intervals for the confidant, married, and functional status variables are not available because of the use of interaction terms.
BMI = body mass index.