TABLE II.
Negative binomial regression analysis of acute-care use
| Variable | RR | 95% CI | p Value |
|---|---|---|---|
| Exposure to PCP | |||
| Yes | 1.92 | 1.76 to 2.10 | <0.001 |
| No | Reference | ||
| Age group | |||
| ≤39 Years | Reference | ||
| 40–49 Years | 0.81 | 0.72 to 0.92 | 0.0006 |
| 50–59 Years | 0.79 | 0.71 to 0.89 | <0.001 |
| 60–69 Years | 0.88 | 0.78 to 0.99 | 0.0311 |
| ≥70 Years | 1.06 | 0.90 to 1.24 | 0.4917 |
| Income quintile | |||
| Q1 (lowest) | 1.17 | 1.06 to 1.29 | 0.0022 |
| Q2 | 1.1 | 0.99 to 1.22 | 0.0519 |
| Q3 | 1.18 | 1.08 to 1.30 | 0.0005 |
| Q4 | 1.1 | 1.00 to 1.20 | 0.0446 |
| Q5 | Reference | ||
| Geographic location | |||
| Urban | Reference | ||
| Rural | 1.42 | 1.29 to 1.56 | <0.001 |
| Score on the CCI | |||
| 0 | Reference | ||
| 1 | 1.31 | 1.17 to 1.46 | <0.001 |
| 2+ | 1.44 | 1.16 to 1.78 | 0.0009 |
| Regimen type | |||
| Anthracycline only | Reference | ||
| Docetaxel | 1.64 | 1.49 to 1.80 | <0.001 |
| Paclitaxel | 0.9 | 0.78 to 1.03 | 0.1140 |
RR = relative risk; CI = confidence interval; PCP = primary care physician; CCI = Charlson comorbidity index.