Table 1.
Baseline characteristics of RAAK samples with OA phenotypes included in the cluster analyses
| Total (n = 36) | Cluster A (n = 26) | Cluster B (n = 10) | P-valuea | |
|---|---|---|---|---|
| Age (s.d.) | 69.7 (7.8) | 69.7 (8.0) | 69.7 (7.7) | 0.534a |
| Females | 28 (78) | 19 (73) | 9 (90) | 0.492a |
| BMI (s.d.) | 28.2 (2.9) | 28.2 (2.5) | 28.2 (4.0) | 0.518a |
| Knee joints | 25 (69) | 20 (77) | 5 (50) | 0.059a |
| KL score (s.d.) | 2.7 (0.6) | 2.7 (0.7) | 2.7 (0.5) | 0.720a |
| OP score (s.d.)c | 2.7 (2.1) | 2.7 (2.2) | 2.6 (1.7) | 0.931b |
| JSN score (s.d.)c | 4.6 (1.2) | 4.5 (1.2) | 5.0 (1.1) | 0.042b |
a
P-value by generalized estimation equation (GEE) with cluster-type as dependent variable (Cluster A as reference) and age, sex and joint-type as covariates.
b
P-value by GEE adjusted for age, sex and KL score as covariates.
c
The OP score or JSN score is defined as the sum of osteophyte grades (0–3) or JSN grades (0–3), respectively determined at the lateral and medial compartments of the tibio-femoral knee joint or at the inferior and superior compartments of the acetabular-femoral hip joint. JSN: joint space narrowing; OP: osteophyte; KL: Kellgren and Lawrence score.