Multivariate regression: predictors of health services costs in inflammatory myopathies (n = 1102) in 2003. The outcome was the natural logarithm of health services costs, in 2008 Canadian dollars.
| Predictor | Regression Coefficients | ||
|---|---|---|---|
| Physician Services | Acute Care Hospital Costs | Total Costs* | |
| Being a woman | 0.42 (0.20, 0.65) | −0.05 (−0.53, 0.43) | 0.39 (0.11, 0.67) |
| Age | 0.02 (0.01, 0.02) | 0.04 (0.02, 0.05) | 0.03 (0.02, 0.03) |
| Disease duration | −0.04 (−0.07, −0.01) | −0.05 (−0.11, 0.01) | −0.05 (−0.08, −0.02) |
| Prior hospitalization for myositis | 0.17 (−0.05, 0.39) | 0.89 (0.42, 1.37) | 0.34 (0.07, 0.61) |
| Polymyositis (vs dermatomyositis) | 0.13 (−0.09, 0.35) | 0.29 (−0.19, 0.77) | 0.18 (−0.09, 0.45) |
| Residence outside Montreal | −0.19 (−0.40, 0.03) | 0.16 (−0.31, 0.63) | −0.12 (−0.38, 0.15) |
| Upper tertile income area** | −0.37 (−0.69, −0.05) | −0.91 (−1.61, −0.22) | −0.52 (−0.92, −0.13) |
Adjusted R values are 0.063 for physician services, 0.043 for acute care hospital costs, and 0.067 for total costs.
↵* Includes physician services, hospital costs, diagnostic tests and procedures, and outpatient surgeries and procedures.
↵** The reference group for income is the middle and lower tertiles combined.