(a) 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 inflammatory disease. The results are presented as Unstandardised Coefficients (β) with 95% Confidence intervals
| Variable | Model 1 | Model 2 | Model 3 | Model 4 |
|---|---|---|---|---|
| Clinical subgroup | ||||
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| Inflammatory disease rehab center | Ref. | Ref. | Ref. | Ref. |
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| Inflammatory disease inpatient hospital unit | 13,412 (8,744 to 18,080)** | 12,952 (8,299 to 17,605)** | 12,935 (8,173 to 17697)** | 13,721 (8,806 to 18,635)** |
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| Inflammatory disease outpatient hospital unit | −2,595 (−9,388 to 4,196) | −2,406 (−5,875 to 3,727) | −2,560 (−9,514 to 4,395) | −73 (−7,089 to 6,940) |
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| Gender (ref. female) Male | −2,968 (−8,055 to 2,118) | −3,272 (−8,371 to 1,826) | −3,555 (−8,744 to 1,633)* | −4,025 (−9,402 to 1,352) |
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| Age (ref. 67 or less) 68+ | 1,682 (−4,712 to 8,077) | 1,843 (−4,583 to 8,271) | 4,430 (−1,762 to 10,624) | 4,045 (−2,379 to 10,469) |
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| Comorbidity (ref. none) | ||||
| One | 3,170 (−2,373 to 8,714) | 3,291 (−2,282 to 8,864) | 3,795 (−1,849 to 9,439) | 4,851 (−1,002 to 10,632) |
| Two or more | 2,939 (−2,830 to 8,708) | 2,274 (−3,457 to 8,005) | 2,885 (−3,003 to 8,775) | 3,346 (−2,759 to 9,452) |
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| Working status (ref. employed) Not employed | 1,732 (−3,288 to 6,753) | 1,716 (−3,333 to 6,765) | 448 (−4,589 to 5,485) | 402 (−4,827 to 5,632) |
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| MHAQ | −5,179 (−12,174 to 1,815) | — | 1,151 (−4,092 to 6,396) | 4,122 (−921 to 9,166)* |
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| SF Physical function | −172 (−301 to −42)** | −106 (−202 to −11)* | — | — |
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| SF Mental function | −1 (−21to 19) | 41 (−21 to 19) | — | — |
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| Assistive tools | 1,447 (414 to 2,540)** | 1,315 (268 to 2,361)* | 1,619 (542 to 2,695)** | — |
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| Constant | 16,367 (4,568 to 28,168)** | 10,292 (10763 to 18,819)** | 3,367 (−3,134 to 9,869) | 2,178 (−4,522 to 8,878) |
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| Adj R-squared | 0.3593 | 0.3518 | 0.3276 | 0.2750 |
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.