Table 1.
Demographics of the study population
| Variable | Responders (n = 131) | Non-responders (n = 75) | Difference 95% CI |
|---|---|---|---|
| Age (yr) | 63.4 ± 9.03 | 62.4 ± 9.21 | –3.630, 1.564 |
| Female Male |
74 (56.5) 57 (43.5) |
46 (61.3) 29 (38.7) |
–0.086, 0.179 |
| Smoker Non smoker |
44 (33.6) 87 (66.4) |
23 (30.7) 52 (69.3) |
–0.108, 0.170 |
| Employed Unemployed (retired, housewives, etc) |
46 (35.1) 85 (64.9) |
22 (29.3) 53 (70.7) |
–0.077, 0.198 |
| Obese Non-obese |
51 (38.9) 80 (61.1) |
31 (41.3) 44 (58.7) |
–0.158, 0.111 |
| Depression No depression |
12 (9.2) 119 (90.8) |
22 (29.3) 53 (70.7) |
–0.154, –0.164 |
| Prior knee surgery None prior knee surgery |
40 (30.5) 91 (69.5) |
30 (40.0) 45 (60.0) |
–0.238, 0.042 |
| Opioid use Yes No |
35 (26.7) 96 (73.3) |
38 (50.7) 37 (49.3) |
0.105, 0.380 |
| Duration of pain (yr) | 6.60 ± 3.47 | 6.89 ± 4.36 | –0.740, 1.441 |
| Degree of degeneration KL ≤ 2 KL > 2 |
68 (51.9) 63 (48.1) |
29 (38.7) 46 (61.3) |
–0.253, 0.007 |
| Baseline NRS score | 7.24 ± 1.17 | 6.83 ± 1.22 | 0.065, 0.751 |
Values are presented as mean ± standard deviation or number (%).
Responders was described as 50% or more reduction of NRS lasting at least 6 months.
The difference with 95% CI between responders and non-responders proportions or means is presented.
CI: confidence interval, KL: Kellegren–Lawrence, NRS: numerical rating scale.