Table 2

 Prevalence and odds ratios of knee chondrocalcinosis, osteoarthritis, and pyrophosphate arthropathy

Prevalence (%)OR (95% CI)aOR (95% CI)
SiblingsCommunity
CC, chondrocalcinosis; OA, osteoarthritis; PA, pyrophosphate arthropathy; OR, odds ratio; CI, confidence interval; aOR, adjusted OA by age, sex, BMI, knee pain, CC (for all OA only) and OA (for all CC only).
*p⩽0.05; **p⩽0.01.
All CC 15/116 (13)119/1727 (6.9)2.01 (1.13 to 3.56)*1.16 (0.58 to 2.29)
Isolated CC 6/122 (5)60/1729 (3.5)1.44 (0.61 to 3.40)1.07 (0.41 to 2.78)
All OA 62/120 (52)466/1725 (27.0)2.89 (1.99 to 4.20)**2.17 (1.35 to 3.48)**
Isolated OA 48/122 (39)405/1729 (23.4)2.12 (1.45 to 3.10)**1.74 (1.10 to 2.76)*
PA (CC+OA) 9/122 (7)59/1729 (3.4)2.25 (1.09 to 4.66)*1.09 (0.44 to 2.68)