Demographic information for patients in this study, stratified by percent relief category on the first block. The breakdown of block 2 results into percent relief categories of <50%, 50%–79%, and ≥80%, with 95% CIs for each proportion.
| Percent relief on block 1 | |||
| Patients | 50%–79% | ≥80% | |
| 85 | 139 | ||
| Sex (%) | Female | 40 (47.1) | 83 (59.7) |
| Male | 45 (52.9) | 56 (40.3) | |
| Race (%) | White | 84 (98.8) | 137 (98.6) |
| Other | 1 (1.2) | 2 (1.4) | |
| Age | Mean±SD | 61.6±12.1 | 61.8±13.7 |
| Percent relief on block 2 (%) | <50% | 19 (22.4) | 4 (2.9) |
| 95% CI 14.0 to 32.7 | 95% CI 0.7 to 7.2 | ||
| 50%–79% | 29 (34.1) | 22 (15.8) | |
| 95% CI 24.2 to 45.2 | 95% CI 10.2 to 23.0 | ||
| ≥80% | 37 (43.5) | 113 (81.3) | |
| 95% CI 32.8 to 54.7 | 95% CI 73.8 to 87.4 | ||