(b) The influence of clinical subgroup, age, gender, comorbidity, and work status on total health care costs (sum of cost groups 1 to 3 for rehabilitation period and 6 months after) for patients with osteoarthritis (OA). The results are presented as Unstandardised Coefficients (β) with 95% Confidence intervals
| Variable | Model 1 | Model 2 | Model 3 | Model 4 |
|---|---|---|---|---|
| Clinical subgroup | ||||
|
| ||||
| OA (ref. conventional rehabilitation) | Ref. | Ref. | Ref. | Ref. |
|
| ||||
| OA postsurgery rehabilitation | −675 (−2,664 to 1,313) | −220 (−2,135 to 1,694) | −683 (−2,658 to 1,290) | −57 (−2,723 to1,207) |
|
| ||||
| Gender (ref. female) Male | −2,086 (−4,166 to −6)* | −2,037 (−4,125 to −50) | −2,103 (−4,142 to −65)* | 1,915 (−3,903 to 72) |
|
| ||||
| Age (ref. 67 or less) 68+ | 651 (−1,282 to 2585) | 386 (−1,527 to 2,300) | 693 (−1,217 to 2,605) | 578 (−1,312 to 2,468) |
|
| ||||
| Comorbidity (ref. none) | ||||
| One | 1,054 (−1,445 to 3,554) | 1,080 (−1,429 to 3,590) | 1,178 (−1,265 to 3,622) | 1,148 (−1,292 to 3,589) |
| Two or more | 1,341 (−1,160 to 3,842) | 1,470 (−1,036 to 3,977) | 1,514 (−891 to 3,920) | 1,507 (−335 to 3,163) |
|
| ||||
| Working status (ref. employed) Not employed | 192 (−1,805 to 2,190) | −34 (−2,020 to 1,951) | 263 (−1,707 to 2,234) | 128 (−1,814 to 2,072) |
|
| ||||
| MHAQ | 1,512 (−365 to 3,390) | — | 1,614 (−199 to 3,428) | 1,414 (−335 to 3,163) |
|
| ||||
| SF Physical function | −2 (−13 to 9) | −4 (−15 to 6) | — | — |
|
| ||||
| SF Mental function | −1 (−9 to 6) | −2 (−9 to 6) | — | — |
|
| ||||
| Assistive tools | −216 (−738 to 305) | −106 (−612 to 399) | −220 (−739 to 299) | — |
| Constant | 6,592 (3,301 to 9,882)** | 7,650 (4,621 to 10,679)** | 6,158 (3,303 to 9,013)** | 6,244 (3,399 to 9,090)** |
|
| ||||
| Adj R-squared | 0.0101 | 0.0128 | 0.0193 | 0.0209 |
Cost values (in Euro) are estimated means by OLS. All costs are presented in Euros: 1€ = 8 NOK.
*P-value < .05, ** P-value < .01.
The difference between the three models is only the inclusion of different severity measures in addition to clinical setting, diagnosis, age, gender and working status.
Model 1: all severity measures are included: MHAQ, SF36 Physical function, SF36 Mental function, and assistive tools.
Model 2: we include only SF36 Physical function, SF36 Mental function, and assistive tools.
Model 3: we include only MHAQ and assistive tools.
Model 4: we include only MHAQ.