Results of multiple logistic regression analyses of high costs v low costs for each of the four different disease duration groups
| Disease duration, years | Associated variable | Estimate (β) | SE (β) | p | OR | 95% CI |
|---|---|---|---|---|---|---|
| Number of patients with complete demographic, clinical, and psychological data is shown in parentheses. | ||||||
| OR, odds ratio, 95% CI, 95 confidence interval. | ||||||
| 0 to ⩽2 (n = 59) | Age | −0.094 | 0.039 | 0.016 | 0.910 | 0.843 to 0.982 |
| VAS disease activity | 0.060 | 0.029 | 0.036 | 1.062 | 1.004 to 1.124 | |
| Education <12 years | −3.365 | 1.506 | 0.026 | 0.035 | 0.002 to 0.662 | |
| ESR | 0.117 | 0.039 | 0.003 | 1.124 | 1.040 to 1.214 | |
| RF positive | −5.095 | 1.565 | 0.001 | 0.006 | 0.000 to 0.132 | |
| Anxiety | 0.394 | 0.142 | 0.055 | 1.483 | 1.123 to 1.959 | |
| Constant | −3.320 | 3.491 | 0.342 | |||
| 2 to ⩽6 (n = 165) | Education < 12 years | −1.548 | 0.600 | 0.010 | 0.213 | 0.066 to 0.689 |
| HAQ | 1.917 | 0.382 | 0.000 | 6.799 | 3.218 to 14.365 | |
| VAS general wellbeing | 0.028 | 0.009 | 0.032 | 1.028 | 1.009 to 1.047 | |
| Constant | −1.500 | 0.546 | 0.006 | |||
| 6 to ⩽10 (n = 90) | HAQ | 2.087 | 0.444 | 0.000 | 8.060 | 3.38 to 19.226 |
| Constant | −2.329 | 0.551 | 0.000 | |||
| >10 (n = 84) | HAQ | 1.372 | 0.375 | 0.000 | 3.941 | 1.890 to 8.220 |
| Constant | −2.105 | 0.650 | 0.001 | |||