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.

Korean J Pain 2022;35:447~457 https://doi.org/10.3344/kjp.2022.35.4.447
© Korean J Pain