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TABLE 1
—Means and Standard Deviations or Percentages of Baseline Variables, by Assigned Provider Group
| Assigned Provider Group | ||
| Variable | Medical (n = 340) | Chiropractic (n = 341) |
| Mean SF-36 mental health score (SD) | 70.1 (16.8) | 72.5 (16.2) |
| Mean Roland-Morris Disability Questionnaire score (SD) | 11.1 (5.5) | 10.8 (5.3) |
| Mean average pain during past week (SD) | 4.6 (1.9) | 4.6 (1.9) |
| Mean age, y (SD) | 49.3 (16.6) | 52.6 (16.6) |
| % with pain for >1 y prior to study | 49 | 45 |
| % with leg pain | 57 | 59 |
| % male | 50 | 46 |
| Education, % | ||
| High school or less | 27 | 32 |
| Vocational school or some college | 37 | 42 |
| College degree or more | 36 | 26 |
| Race/ethnicity, % | ||
| Non-Latino White | 57 | 64 |
| Latino | 33 | 26 |
| Other | 10 | 10 |