Table 1.
Demographic data of each cluster.
| Variables | Cluster 1 (N = 28, 28%) | Cluster 2 (N = 19, 19%) | Cluster 3 (N = 54, 53%) | P |
|---|---|---|---|---|
| Type of OA | ||||
| HOA, n (%) | 13 (46) | 4 (21) | 25 (47) | 0.135 |
| KOA, n (%) | 15 (54) | 15 (79) | 29 (53) | |
|
| ||||
| Age, mean ± SD | 63.8 ± 14.1 | 64.6 ± 10.5 | 62.7 ± 11.6 | 0.845 |
| Females, n (%) | 25 (89) | 17 (89) | 40 (74) | 0.327 |
| BMI, mean ± SD (kg/m2) | 24.2 ± 2.6 | 25.5 ± 4.2 | 24.0 ± 3.0 | 0.488 |
| Pain duration, mean ± SD (month) | 71.7 ± 53.5ab | 37.6 ± 38.5 | 40.4 ± 49.1 | <0.01 |
|
| ||||
| HOOS, KOOS | ||||
| Pain symptoms, mean ± SD (0–100) | 47.1 ± 16.7ab | 63.5 ± 13.0c | 74.7 ± 14.8 | <0.001 |
| Function of ADL, mean ± SD (0–100) | 55.0 ± 18.8ab | 75.2 ± 11.5c | 84.8 ± 12.6 | <0.001 |
|
| ||||
| Analgesic use | ||||
| NSAIDs, n (%) | 22 (79) | 8 (42) | 19 (35) | <0.001 |
| Duloxetine, n (%) | 5 (18) | 0 (0) | 0 (0) | <0.001 |
| Tramadol, n (%) | 3 (11) | 0 (0) | 0 (0) | <0.05 |
There were significant differences in pain duration, pain symptoms, disability, and analgesic use between each cluster. aSignificant group difference between clusters 1 and 2 (P < 0.05, Bonferroni). bSignificant group difference between clusters 1 and 3 (P < 0.05, Bonferroni). cSignificant group difference between clusters 2 and 3 (P < 0.05, Bonferroni). OA, osteoarthritis; HOA, hip osteoarthritis; KOA, knee osteoarthritis; BMI, body mass index; NRS, numerical rating scale; HOOS, Hip Disability and Osteoarthritis Outcome Score; KOOS, Knee Injury and Osteoarthritis Outcome Score; ADL, activities of daily living; NSAIDs, nonsteroidal anti-inflammatory drugs.