Table A.1.
Comparison of patient characteristics between patients with a recorded diagnosis of osteoarthritis (N = 201,462) and knee osteoarthritis (N = 6043) in their EHR
| Patient characteristics | Recorded diagnosis of OA (N = 201,462) |
Missing |
Recorded diagnosis of knee OA (N = 6043) |
Missing |
|---|---|---|---|---|
| n (%) | n (%) | n (%) | n (%) | |
| Age (years), mean (SD) | 67.2 (11.1) | – | 68.7 (10.7) | – |
| Gender | ||||
| Female | 123,376 (61.2) | – | 3633 (60.1) | – |
| Aboriginal and/or Torres Strait Islander | 2671 (1.6) | 38,148 (18.9) | 86 (1.7) | 1112 (18.4) |
| IRSAD quintiles | 1228 (0.6) | 44 (0.7) | ||
| 1 (most disadvantaged) | 41,600 (20.8) | 1350 (22.5) | ||
| 2 | 39,539 (19.7) | 1120 (18.7) | ||
| 3 | 48,122 (24.0) | 1452 (24.2) | ||
| 4 and 5 (most advantaged) | 70,973 (35.4) | 2077 (34.6) | ||
| Patient geographical location∗ | 1068 (0.5) | 41 (0.7) | ||
| Major cities of Australia | 111,075 (55.4) | 3274 (54.6) | ||
| Inner regional Australia | 62,221 (31.0) | 1878 (31.3) | ||
| Remote Australia | 27,098 (13.5) | 850 (14.2) | ||
| Healthcare card | 53,410 (26.5) | – | 1908 (31.6) | – |
| Member of Department of Veteran's Affairs | 8537 (4.2) | – | 272 (4.5) | – |
| BMI (kg/m2), mean (SD) | 30.1 (6.5) | 137,071 (68.0) | 31.8 (7.0) | 3826 (63.3) |
| Prescribing of OA medication/s | 57,090 (33.8) | 32,591 (16.2) | 2205 (44.4) | 1074 (17.8) |
| Count of chronic conditions from CCI, median [IQR] | 0 [0, 1] | 15,875 (7.9) | 0 [0, 1] | 289 (4.8) |
| 0 conditions | 113,097 (60.9) | 3105 (54.0) | ||
| 1 condition | 49,216 (26.5) | 1703 (29.6) | ||
| 2 conditions | 16,407 (8.8) | 649 (11.3) | ||
| 3 or more conditions | 6867 (3.7) | 297 (5.2) | ||
| Mental health condition | 46,859 (24.2) | 8178 (4.1) | 1606 (27.3) | 157 (2.6) |
| Previous knee replacement | 9432 (4.7) | 1264 (0.6) | 748 (12.4) | 23 (0.4) |
| Past knee surgery on either knee (excluding TKR) | 6070 (3.0) | 1007 (0.5) | 447 (7.4) | 29 (0.5) |
| Smoking status | 13,504 (6.7) | 292 (4.8) | ||
| Smoker | 16,948 (9.0) | 385 (6.7) | ||
| Ex-smoker | 68,239 (36.3) | 2037 (35.4) | ||
| Non-smoker | 102,771 (54.7) | 3329 (57.9) | ||
| Number of practice visits in year prior to study baseline, median [IQR] | 11 [6, 18] | 12 [7, 20] | ||
| Number of general practice clinics | 483 | 426 | ||
AbbreviationsTKR = total knee replacement; SD = standard deviation; IRSAD=Index of Relative Socio-economic Advantage and Disadvantage (37); BMI = body mass index; OA = osteoarthritis; CCI=Charlson comorbidity index; IQR = interquartile range.
Notes: Counts and percentages presented unless otherwise stated.
∗Based on Australian Bureau of Statistics (ABS) Australian Statistical Geography Standard (ASGS) remoteness areas (47).