Table 5b.
Reduced Logistic Regression Model of HAQ-DI, Disease Type, Disease Duration and Self-Reported Physically Demand-ing Work on WD. Variables: Sex, Age, and ‘Less than High School Education’ were Removed from the Model
| Explanatory Variable (X) | βX Estimate | Standard Error | Odds Ratio | Wald Test p-Value |
|---|---|---|---|---|
| N | 148 | - | - | - |
| HAQ-DI score | 1.858 | 0.348 | 6.412 | <0.001 |
| Disease type | 0.016 | |||
| Indicator lcSSc | 1.239 | 0.549 | 3.451 | 0.024 |
| Indicator dcSSc | 1.314 | 0.574 | 3.721 | 0.022 |
| Self-reported disease duration | 0.041 | 0.022 | 1.041 | 0.069 |
| Self-reported physically demanding work | 1.119 | 0.45 | 3.062 | 0.013 |
| Constant | -3.565 | 0.654 | 0.028 | <0.001 |
Equation: Logit (p) = ln [p/(1-p)] = -2.930 + 1.775[HAQ-DI] + 0.743[lcSSc] + 1.316[dcSSc] + 0.043[SR duration] where p = proportion with WD.