Table 3 Patient characteristics and health care utilization in chart review population
|  | Yes axSpA (n = 162) | No axSpA (n = 409) | Uncertain axSpA (n = 29) | ||||||
|---|---|---|---|---|---|---|---|---|---|
No./Mean | SD/% | 95% CI | No./Mean | SD/% | 95% CI | No./Mean | SD/% | 95% CI | |
Age | 56.2 | 13.5 | 54.1, 58.3 | 60.0 | 13.2 | 58.7, 61.2 | 58.1 | 14.3 | 52.9, 63.3 |
Gender (Male) | 155 | 95.7 | 91.3, 98.3 | 363 | 88.8 | 85.3, 91.7 | 28 | 96.6 | 82.2, 99.9 |
Race | |||||||||
 White | 128 | 79.0 | 71.9, 85.0 | 305 | 74.6 | 70.1, 78.7 | 22 | 75.9 | 56.5, 89.7 |
 Black | 18 | 11.1 | 6.7, 17.0 | 63 | 15.4 | 12.0, 19.3 | 4 | 13.8 | 3.9, 31.7 |
 Other | 2 | 1.2 | 0.2, 4.4 | 6 | 1.5 | 0.5, 3.2 | 0 | 0.0 | 0.0, 11.9 |
 Unknown | 14 | 8.6 | 4.8, 14.1 | 35 | 8.6 | 6.0, 11.7 | 3 | 10.3 | 2.2, 27.4 |
Ethnicity | |||||||||
 Non-Hispanic | 144 | 88.9 | 83.0, 93.3 | 367 | 89.7 | 86.4, 92.5 | 27 | 93.1 | 77.2, 99.2 |
 Hispanic | 7 | 4.3 | 1.8, 8.7 | 19 | 4.6 | 2.8, 7.2 | 2 | 6.9 | 0.9, 22.8 |
 Unknown | 11 | 6.8 | 3.4, 11.8 | 23 | 5.6 | 3.6, 8.3 | 0 | 0.0 | 0.0, 11.9 |
Geographic region | |||||||||
 Southeast | 57 | 35.2 | 27.9, 43.1 | 153 | 37.4 | 32.7, 42.3 | 14 | 48.3 | 29.5, 67.5 |
 North Atlantic | 35 | 21.6 | 15.5, 28.7 | 84 | 20.5 | 16.7, 24.8 | 7 | 24.1 | 10.3, 43.5 |
 Midwest | 30 | 18.5 | 12.9, 25.4 | 68 | 16.6 | 13.2, 20.6 | 2 | 6.9 | 0.9, 22.8 |
 Continental | 22 | 13.6 | 8.7, 19.8 | 58 | 14.2 | 11.0, 17.9 | 4 | 13.8 | 3.9, 31.7 |
 Pacific | 18 | 11.1 | 6.7, 17.0 | 46 | 11.2 | 8.4, 14.7 | 2 | 6.9 | 0.9, 22.8 |
Duration of active VA system use during study period (years) | 9.3 | 2.0 | 9.0, 9.6 | 8.9 | 2.4 | 8.7, 9.2 | 9.0 | 2.2 | 8.2, 9.8 |
#Provider visits/ year during active system use period | 43.6 | 39.3 | 37.5, 49.6 | 45.9 | 42.6 | 41.7, 50.0 | 25.5 | 27.3 | 15.6, 35.5 |