Table 1.
Comparison of study participants with and without neuropathic-like pain symptoms by demographic characteristics and OA-related factors
| Characteristics | NP Group (N = 32) |
Non-NP Group (N = 152) |
|||||
|---|---|---|---|---|---|---|---|
| No. | M (or %) | SD | No. | M (or %) | SD | P | |
| Demographic factors | |||||||
| Age, y | 32 | 54.6 | 7.0 | 152 | 58.6 | 7.7 | 0.01 |
| Sex | 0.89 | ||||||
| Male | 12 | 37.5 | 55 | 36.2 | |||
| Female | 20 | 62.5 | 97 | 63.8 | |||
| Race | 0.06 | ||||||
| Non-Hispanic black | 22 | 68.8 | 74 | 48.7 | |||
| Non-Hispanic white | 10 | 31.3 | 78 | 51.3 | |||
| Education (% ≤ high school) | 22 | 68.8 | 66 | 43.4 | 0.06 | ||
| Body mass index | 32 | 35.3 | 10.8 | 152 | 31.2 | 6.6 | 0.05 |
| Normal | 4 | 13.3 | 27 | 18.1 | |||
| Overweight | 7 | 23.3 | 40 | 26.8 | |||
| Obese | 19 | 63.3 | 82 | 55.0 | |||
| Pain length | 32 | 151 | 0.53 | ||||
| <6 mo | 1 | 3.1 | 9 | 6.0 | |||
| 6 mo–1 y | 5 | 15.6 | 10 | 6.6 | |||
| 1–3 y | 8 | 25.0 | 38 | 25.2 | |||
| 3–5 y | 4 | 12.5 | 22 | 14.6 | |||
| ≥5 y | 14 | 43.8 | 72 | 47.7 | |||
| Pain variables | |||||||
| No. of painful joints | 32 | 8.2 | 7.6 | 152 | 5.5 | 5.5 | 0.07 |
| Right knee pain | 5 | 16.7 | 40 | 29.6 | |||
| Left knee pain | 5 | 16.7 | 28 | 20.7 | |||
| Bilateral knee pain | 20 | 66.7 | 67 | 49.6 | |||
| GCPS pain intensity | 32 | 78.4 | 14.0 | 152 | 51.2 | 22.0 | <0.01 |
| Concomitant conditions | |||||||
| Chronic hip pain | 21 | 65.6 | 82 | 54.3 | 0.33 | ||
| Diabetes mellitus | 5 | 15.6 | 18 | 11.8 | 0.77 | ||
| No. of painful sites | 32 | 4.7 | 2.7 | 152 | 3.9 | 2.2 | 0.08 |
No covariates were included in these analyses. Bold formatting indicates significant P values, at P < 0.05.
GCPS = Grade Chronic Pain Scale; NP = neuropathic-like pain; OA = osteoarthritis.