| Knee arthritis | Knee osteoarthritis | ||||
---|---|---|---|---|---|---|
Characteristic | Prevalencen(%) | Unadjusted OR (95%CI) | Adjusted OR* (95%CI) | Prevalencen(%) | Unadjusted OR (95%CI) | Adjusted OR* (95%CI) |
Sex | ||||||
 Male (n= 500) | 71 (14) | 1.00 | 1.00 | 36 (7) | 1.00 | 1.00 |
 Female (n= 656) | 98 (15) | 1.07 (0.77-1.49) | 1.15 (0.77-1.71) | 62 (9) | 1.34 (0.87-2.06) | 1.51 (0.91-2.52) |
Age group | ||||||
 <50 years (n= 363) | 25 (7) | 1.00 | 1.00 | 15 (4) | 1.00 | 1.00 |
 50-59 years (n= 290) | 39 (13) | 2.10 (1.24-3.55) | 1.95 (1.09-3.48) | 18 (6) | 1.55 (0.77-3.13) | 1.36 (0.64-2.88) |
 60-69 years (n= 230) | 37 (16) | 2.60 (1.52-4.45) | 1.99 (1.08-3.66) | 31 (13) | 3.65 (1.92-6.93) | 2.76 (1.34-5.69) |
 70-79 years (n= 178) | 45 (25) | 4.67 (2.75-7.92) | 3.16 (1.67-5.99) | 26 (15) | 4.00 (2.06-7.76) | 2.78 (1.26-6.11) |
 ≥80 years (n= 82) | 22 (27) | 5.03 (2.66-9.50) | 5.26 (2.44-11.35) | 7 (9) | 2.29 (0.90-5.81) | 1.99 (0.65-6.08) |
Body Mass Index (BMI) | ||||||
 Underweight / normal weight (n= 430) | 36 (8) | 1.00 | 1.00 | 15 (3) | 1.00 | 1.00 |
 Overweight (n= 383) | 49 (13) | 1.61 (1.02-2.54) | 1.87 (1.14-3.07) | 27 (7) | 2.10 (1.10-4.00) | 2.11 (1.07-4.15) |
 Obese (n= 248) | 68 (27) | 4.21 (2.71-6.54) | 5.47 (3.35-8.95) | 49 (20) | 6.83 (3.74-12.48) | 7.35 (3.85-14.02) |
Highest level of education | ||||||
 Primary school or less (n= 54) | 19 (35) | 1.00 | 1.00 | 10 (19) | 1.00 | 1.00 |
 Year 7–10 (n= 263) | 58 (22) | 0.50 (0.27-0.95) | 0.56 (0.26-1.21) | 30 (11) | 0.55 (0.25-1.21) | 0.50 (0.19-1.32) |
 Year 11–12 (n= 213) | 24 (11) | 0.22 (0.11-0.45) | 0.25 (0.11-0.60) | 13 (6) | 0.28 (0.11-0.67) | 0.34 (0.12-0.98) |
 Trade / technical (n= 260) | 27 (10) | 0.20 (0.10-0.40) | 0.28 (0.13-0.65) | 16 (6) | 0.28 (0.12-0.65) | 0.36 (0.13-1.01) |
 University (n= 356) | 40 (11) | 0.22 (0.11-0.42) | 0.34 (0.15-0.78) | 28 (8) | 0.36 (0.16-0.79) | 0.40 (0.15-1.11) |
Marital status | ||||||
 Married / living with partner (n= 924) | 119 (13) | 1.00 | 1.00 | 67 (7) | 1.00 | 1.00 |
 Single / divorced / widowed (n= 222) | 47 (21) | 1.83 (1.26-2.66) | 1.50 (0.96-2.36) | 29 (13) | 1.98 (1.24-3.14) | 2.11 (1.23-3.62) |
Country of birth | ||||||
 Australia (n= 894) | 131 (15) | 1.00 | 1.00 | 70 (8) | 1.00 | 1.00 |
 Other (n= 255) | 37 (15) | 0.98 (0.66-1.46) | 1.16 (0.74-1.82) | 27 (11) | 1.39 (0.87-2.23) | 1.62 (0.95-2.78) |
Location | ||||||
 Metropolitan (n=775) | 113 (15) | 1.00 | 1.00 | 67 (9) | 1.00 | 1.00 |
 Provincial or rural (n=381) | 56 (15) | 1.01 (0.72-1.44) | 0.88 (0.54-1.44) | 31 (8) | 0.94 (0.60-1.46) | 1.00 (0.54-1.85) |