Table 1 Patients’ characteristics
|  | Total (n = 503) |
|---|---|
Age on index date, mean (SD) | 64.3 (11.6) |
Sex, female, n (%) | 302 (60.0) |
Type of record of diagnosis on index date, n (%)  - Codified diagnosis  - Narrative diagnosis   Received a code during the observation period after date of narrative diagnosis | 203 (40.4) 300 (59.6) 86 (28.7) |
Diagnosed during observation period by, n (%)  - GP   GP and other healthcare provider   GP only  - Other healthcare provider (no GP)   Orthopaedic surgeon only   Radiologist only   Radiologist and orthopaedic surgeon   Physiotherapist only   Other combinations of abovementioned healthcare providers | 357 (71.0) 267 (74.8) 90 (25.2) 146 (29.0) 60 (41.1%) 42 (28.8%) 23 (15.8%) 3 (2.1%) 18 (12.3%) |
Site of complaints during observation period, n (%) - unilateral - bilateral - unknown | 415 (82.5) 67 (13.3) 15 (3.0) |
Concurrent codified comorbidities, n (%)  - Hyperlipidaemia  - Hypertension  - Diabetes  - Myocardial infarct  - Stroke/TIA  - Peripheral arterial disease  - COPD  - Overweight  - Asthma  - Fibromyalgia  - Rheumatoid arthritis  - Hip OA  - Spinal OA  - Knee complaints code   Among patients with narrative diagnosis on index date   Patients with codified diagnosis on index date  - Lower limb trauma | 66 (13.1) 205 (40.8) 72 (14.3) 53 (10.5) 28 (5.6) 9 (1.8) 32 (6.4) 52 (10.3) 50 (9.9) 4 (0.8) 15 (3.0) 24 (4.8) 31 (6.2) 317 (63.0) 222 (74.0) 95 (46.8) 112 (22.3) |