Table 1

Characteristics of participants by verified self-report of knee replacement surgery

VariableTKANo TKA
Age (years)
 45–4920 (0.7%)28 985 (14.3%)
 50–5460 (2.1%)35 560 (17.6%)
 55–59168 (5.8%)36 796 (18.2%)
 60–64362 (12.4%)31 346 (15.5%)
 65–69500 (17.1%)24 788 (12.3%)
 70–74546 (18.7%)16 741 (8.3%)
 75–79493 (16.9%)11 443 (5.7%)
 80–84572 (19.6%)11 797 (5.8%)
 85+195 (6.7%)4 776 (2.4%)
 Mean72.661.7
Sex
 Male1397 (46.9%)94 847 (47.8%)
 Female1519 (53.1%)107 385 (52.2%)
Education level
 Some high school1319 (46.2%)64 554 (32.3%)
 High school243 (8.5%)19 970 (10.0%)
 Post school qualification947 (33.2%)65 373 (32.7%)
 University degree347 (12.1%)49 741 (24.9%)
Income/year
 <$20k953 (34.8%)36 717 (18.7%)
 $20–50k814 (29.7%)51 051 (26.0%)
 $50–70170 (6.2%)22 623 (11.5%)
 $70k+230 (8.4%)52 793 (26.9%)
 Rather not say575 (21.0%)33 036 (16.8%)
Self-rated health
 Excellent or Good2109 (74.3%)173 391 (87.0%)
 Poor or very poor729 (25.7%)25 834 (13.0%)
Number of chronic conditions
 No conditions277 (9.5%)51 722 (25.6%)
 1 health condition675 (23.1%)61 802 (30.6%)
 2 health conditions762 (26.1%)45 717 (22.6%)
 3 health conditions617 (21.2%)24 922 (12.3%)
 4+ health conditions585 (20.1%)18 069 (8.9%)
Treated for osteoarthritis in last month
 No2100 (72.0%)189 079 (93.5%)
 Yes816 (28.0%)13 153 (6.5%)
Private health insurance status
 Private1874 (64.3%)131 417 (65.0%)
 DVA140 (4.8%)3,002 (1.5%)
 None902 (30.9%)67 813 (33.5%)
Used paracetamol in last 2 weeks
 No1794 (61.5%)155 382 (76.8%)
 Yes1122 (38.5%)46 850 (23.2%)
Psychological distress
 Low distress2202 (78.2%)154 867 (78.0%)
 Moderate distress406 (14.4%)29 758 (15.0%)
 High/very high distress209 (7.4%)14 010 (7.1%)
BMI categories
 Underweight (<18.5)17 (0.6%)2499 (1.3%)
 Healthy weight (18.5–<25)463 (17.5%)70 580 (37.5%)
 Overweight (25–<30)1040 (39.4%)74 754 (39.7%)
 Obese (30+)1119 (42.4%)40 334 (21.4%)
Physical activity sessions
 0–3 sessions/week642 (22.0%)30 842 (15.3%)
 4–9 sessions/week1053 (36.1%)70 002 (34.6%)
 10–17 sessions/week830 (28.5%)63 373 (31.3%)
 18+ sessions/week391 (13.4%)38 015 (18.8%)
Broken bone in last year
 No2457 (86.6%)175 655 (88.7%)
 Yes381 (13.4%)22 299 (11.3%)
Falls in last 12 months
 01 932 (68.8%)163 172 (83.4%)
 1 or more875 (31.2%)32 581 (16.6%)
Total2916202 232
  • BMI, body mass index; TKA, total knee arthroplasty.