Table 1.
Characteristics of enrolled subjects in INSITE and SIFI.
| Characteristic | Non-Surgical Management (n=46) | SI Joint Fusion (n=274)* | P-value** |
|---|---|---|---|
| Age, mean (SD, range) =65 years old, n (%) |
53.8 (10.6, 29.5-71.1) 8 (17.4%) |
50.6 (11.3, 23.5-71.7) 32 (11.7%) |
0.7245 0.3325 |
| Women, n (% female) | 28 (60.9%) | 195 (71.2%) | 0.1684 |
| Race, n (%) White Black American Indian Hawaiian, Pacific Islander Other |
43 (93.5%) 2 (4.3%) 0 (0.0%) 0 (0.0%) 1 (2.2%) |
263 (96.0%) 5 (1.8%) 1 (0.4%) 1 (0.4%) 4 (1.5%) |
0.4786 |
| Ethnicity Hispanic or Latino, n (%) | 4 (8.7%) | 11 (4.0%) | 0.2459 |
| Body mass index, mean (SD, range) | 30.6 (6.6, 19.4-48.9) | 29.7 (6.5, 14.1-51.0) | 0.1549 |
| Smoking status, n (%) Current smoker Former smoker Never smoker | 3 (6.5%) 13 (28.3%) 30 (65.2%) | 70 (25.5%) 79 (28.8%) 125 (45.6%) | 0.0050 |
| Condition DS SD |
18 (39.1%) 28 (60.9%) |
79 (28.8%) 195 (71.2%) |
0.4132 |
| Prior lumbar fusion (n, %) | 17 (37.0%) | 116 (42.3%) | 0.5222 |
| Years of pain, mean (range) | 5.0 (0.5-38.9) | 5.8 (0.4-41.1) | 0.1059 |
| VAS SI joint pain score, mean (±SD) | 82.3 (10.0) | 80.7 (12.6) | 0.0589 |
| ODI score, mean (±SD) | 56.2 (14.3) | 56.0 (11.9) | 0.2422 |
*
Combines INSITE (n=102) and SIFI (n=172)
**
Fisher p-value for ordinal variables; t test for continuous variables