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Table 1 Severity and compartmental distribution of symptomatic knee ROA, according to age and sex*

From: Gender difference in symptomatic radiographic knee osteoarthritis in the Knee Clinical Assessment – CAS(K): A prospective study in the general population

Age 50–64 years

 

Females (n = 200)

Males (n = 158)

% difference

95% CI

Any knee ROA (all 3 views; any compartment), n (%)

100 (50.0%)

101 (63.9%)

13.9%

3.6%, 23.8%

Severity of ROA (all 3 views; any compartment), n (%)

    

   Mild

56 (28.0%)

68 (43.0%)

15.0%

5.1%, 24.7%

   Moderate/severe

44 (22.0%)

33 (20.9%)

-1.1%

-9.5%, 7.6%

Compartmental ROA, n (%)

    

   PJOA only

37 (18.5%)

55 (34.8%)

16.3%

7.1%, 25.4%

   TJOA only

10 (5.0%)

7 (4.4%)

-0.6%

-5.1%, 4.4%

   Combined TJOA/PJOA

53 (26.5%)

39 (24.7%)

-1.8%

-10.7%, 7.4%

Age 65+ years

 

Females (n = 207)

Males (n = 180)

% difference

95% CI

Any knee ROA (all 3 views; any compartment), n (%)

150 (72.5%)

158 (87.8%)

15.3%

7.4%, 22.9%

Severity of ROA (all 3 views; any compartment), n (%)

    

   Mild

42 (20.3%)

51 (28.3%)

8.0%

-0.5%, 16.6%

   Moderate/severe

108 (52.2%)

107 (59.4%)

7.3%

-2.6%, 16.9%

Compartmental ROA, n (%)

    

   PJOA only

43 (20.8%)

43 (23.9%)

3.1%

-5.1%, 11.5%

   TJOA only

10 (4.8%)

3 (1.7%)

-3.2%

-7.2%, 0.6%

   Combined TJOA/PJOA

97 (46.9%)

112 (62.2%)

15.4%

5.4%, 24.9%

  1. *Figures are based on 745 participants in CAS(K) – exclusions are total knee replacement in index knee, inflammatory arthropathy, spoilt/missing films, or no knee pain days in last 6 months.
  2. ROA = Radiographic osteoarthritis; PJOA = Patellofemoral joint osteoarthritis; TJOA = Tibiofemoral joint osteoarthritis.