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Table 5 Associations with (i) the term 'osteoarthritis' (group 1 definition) (ii) the terms 'osteoarthritis' and 'degenerative joint disease' (group 2 definition) and (iii) the terms 'osteoarthritis', 'degenerative joint disease' and any descriptive radiological feature of knee osteoarthritis (group 3 definition), from Radiologists' reports, summarised by the odds ratio (95% confidence interval)

From: A cross sectional study of requests for knee radiographs from primary care

n = 136 Total Group 1 Definition Group 2 Definition Group 3 Definition
   n (%) ORa (95% CI) n (%) ORa (95% CI) n (%) ORa (95% CI)
Male 62 16 (26%) 1.00 33 (53%) 1.00 43 (69%) 1.00
Female 74 14 (19%) 0.55 (0.22, 1.40) 27 (36%) 0.48 (0.24, 0.99) 42 (57%) 0.56 (0.27, 1.17)
Age under 60 69 13 (19%) 1.00 24 (35%) 1.00 37 (54%) 1.00
60 & over 67 17 (25%) 1.40 (0.55, 3.56) 36 (54%) 2.05 (1.00, 4.23) 48 (72%) 2.13 (1.01, 4.49)
Radiologists        
Others 57 7 (12%) 1.00 21 (37%) 1.00 38 (67%) 1.00
Code 7 40 20 (50%) 7.54 (2.69, 21.17) 21 (53%) 1.96 (0.83, 4.61) 28 (70%) 1.17 (0.48, 2.86)
Code 8 39 3 (8%) 0.62 (0.15, 2.59) 18 (46%) 1.60 (0.67, 3.81) 19 (49%) 0.46 (0.19, 1.09)
GP diagnosis/possible diagnosis of OA        
No 86 15 (17%) 1.00 34 (40%) 1.00 52 (60%) 1.00
Yes 50 15 (30%) 1.95 (0,76, 5.00) 26 (52%) 1.60 (0.75, 3.40) 33 (66%) 1.05 (0.48, 2.29)
  1. a adjusted for other presented variables