Table 2

The association between erosive and non-erosive hand osteoarthritis (OA) and the presence of subchondral bone attrition (SBA) of the knee (logistic regression) and the number of knee subregions with SBA (Poisson regression)

Presence of any SBA (logistic regression)Number of subregions within a knee with SBA (Poisson regression)
Crude OR (95% CI)Adjusted OR* (95% CI)Crude RR (95% CI)Adjusted RR* (95% CI)
Model 1 (comparison of three groups of participants)
 No DIP/PIP OA (ref)1.001.001.001.00
 Erosive OA2.19 (1.52, 3.14)1.60 (1.07, 2.38)2.43 (1.84, 3.22)1.71 (1.25, 2.32)
 Non-erosive OA1.77 (1.40, 2.24)1.44 (1.11, 1.86)1.60 (1.30, 1.96)1.25 (1.00, 1.57)
Model 2 (number of affected DIP/PIP joints) (all participants, one model)
 Erosive joints1.02 (0.95, 1.10)1.00 (0.92, 1.08)1.06 (1.00, 1.12)1.03 (0.98, 1.09)
 Non-erosive joints1.10 (1.06, 1.15)1.07 (1.02, 1.12)1.08 (1.05, 1.11)1.04 (1.01, 1.07)
  • *Adjusted for age, sex and BMI.

  • BMI, body mass index; DIP, distal interphalangeal; PIP, proximal interphalangeal; RR, rate ratio.