Demographic characteristics.
| Characteristics | Celecoxib 200 mg bid, n = 402 | Tramadol HCI 50 mg qid, n = 389 | p |
|---|---|---|---|
| Age, yrs | |||
| Mean (SD) | 49.1 (14.8) | 47.9 (14.5) | |
| Range | 18–88 | 18–83 | 0.314 |
| Sex, n (%) | |||
| Male | 170 (42.3) | 159 (40.9) | |
| Female | 232 (57.7) | 230 (59.1) | 0.8384 |
| Race, n (%) | |||
| White | 271 (67.4) | 236 (60.7) | |
| Black | 70 (17.4) | 82 (21.2) | |
| Asian | 8 (2.0) | 12 (3.1) | 0.066 |
| Other | 53 (13.2) | 59 (15.2) | |
| Primary diagnosis | |||
| Back pain, n (%) | 402 (100) | 389 (100) | |
| Duration since first diagnosis (wks) | 0.0729 | ||
| Mean | 418.9 | 364.7 | |
| Range | 2.1–2896.1 | 13.7–2988.9 | |
| Unspecified (n) | 1 | 0 | |
| Severity of LBP (11-point NRS), mean | 6.76 | 6.80 | 0.8300 |
LBP: low back pain; NRS: numeric rating scale.