Table 4.
Regression models predicting DMARD use among respondents with rheumatoid arthritis in the MCBS, 2001 to 2006
| Total cohort | Among respondents without rheumatology visits | Among respondents with rheumatology visits | |
|---|---|---|---|
| Odds ratio (95% confidence interval) | |||
| Number | 1,403 | 1,058 | 345 |
| Age, years | |||
| 65 to 74 | 1.00 | 1.00 | 1.00 |
| 75 to 84 | 0.59 (0.36, 0.95) | 0.36 (0.17, 0.74) | 0.95 (0.49, 1.84) |
| 85+ | 0.10 (0.03, 0.33) | 0.07 (0.01, 0.34) | 0.13 (0.02, 0.91) |
| Gender, female | 1.14 (0.69, 1.88) | 0.99 (0.50, 1.94) | 1.24 (0.63, 2.41) |
| Race | |||
| Non-Hispanic, white | 1.00 | 1.00 | 1.00 |
| Non-Hispanic, black | 0.61 (0.30, 1.22) | 0.70 (0.23, 2.11) | 0.63 (0.25, 1.59) |
| Hispanic | 0.48 (0.18, 1.31) | 0.39 (0.11, 1.38) | 0.68 (0.18, 2.55) |
| Non-Hispanic, other | 1.31 (0.53, 3.29) | 1.55 (0.43, 5.57) | 1.22 (0.26, 5.59) |
| Income (US dollars) | |||
| >50,000 | 1.00 | 1.00 | 1.00 |
| >30,000 to 50.000 | 0.76 (0.28, 2.08) | 0.40 (0.14, 1.09) | 1.12 (0.34, 3.67) |
| >20,000 to 30,000 | 0.57 (0.21, 1.57) | 0.23 (0.08, 0.65) | 1.06 (0.32, 3.57) |
| >15,000 to 20,000 | 0.59 (0.19, 1.81) | 0.24 (0.08, 0.74) | 1.01 (0.23, 4.51) |
| ≤ 15,000 | 0.49 (0.18, 1.34) | 0.16 (0.05, 0.48) | 1.08 (0.31, 3.69) |
| Rheumatology care | 7.69 (5.00, 11.1) | NA | NA |
The sample size is greater than 509 because respondents were included in all years after they met the rheumatoid arthritis definition. Models were adjusted for variables in the table plus education, region of residence (South, Midwest, Northeast, and West), insurance status (private, managed care, and drug insurance), and number of comorbid conditions, as well as year of observation. These models were weighted based on the Medicare Current Beneficiary Survey (MCBS) sampling strategy. NA, not applicable; DMARD, disease modifying anti-rheumatic drug.