Table 1.
Baseline demographics for CROSSBAT
| Randomised cohort |
Observational cohort |
|||
|---|---|---|---|---|
| Variable | Surgical (n=80) | Non-surgical (n=80) | Surgical (n=19) | Non-surgical (n=257) |
| Age, mean (SD), years | 38.1 (13.0) | 39.8 (13.7) | 31.1 (11.5)* | 39.4 (13.7)* |
| Female, n (%) | 42 (53) | 41 (51) | 5 (26) | 115 (45) |
| BMI, mean (SD), kg/m2 | 27.7 (5.2) | 28.4 (6.6) | 26.2 (2.9) | 27.6 (5.5) |
| Left side, n (%) | 41 (51) | 46 (58) | 11 (58) | 120 (47) |
| Mechanism, n (%) | ||||
| Fall <1 m | 70 (90) | 67 (84) | 17 (90) | 232 (92) |
| Fall >1 m | 6 (8) | 8 (10) | 0 (0) | 9 (4) |
| Motor vehicle accident | 2 (3) | 5 (6) | 2 (11) | 11 (5) |
| Education, n (%) | ||||
| High school or lower | 31 (39) | 44 (55) | 11 (58) | 100 (39) |
| TAFE/diploma | 30 (38) | 23 (29) | 4 (21) | 78 (30) |
| University or above | 17 (21) | 12 (15) | 4 (21) | 73 (29) |
| Diabetes mellitus, n (%) | 3 (4) | 4 (5) | 0 (0) | 10 (4) |
| Peripheral vascular disease, n (%) | 1 (1) | 0 (0) | 0 (0) | 1 (1) |
| Alcohol, n (%)† | 60 (78) | 63 (79) | 15 (79) | 177 (69) |
| Smoker, n (%)‡ | 29 (36) | 28 (35) | 9 (47) | 74 (29) |
| Working, n (%) | 64 (80) | 65 (81) | 15 (79) | 197 (77) |
| Insurance status, n (%) | ||||
| Public | 50 (63) | 57 (71) | 7 (37) | 160 (63) |
| Private | 18 (23) | 19 (24) | 9 (47) | 75 (30) |
| Compensation | 10 (13) | 3 (4) | 3 (16) | 18 (7) |
*Surgical group was significantly younger than non-surgical group in the observational cohort (p=0.007).
†A patient was described as consuming alcohol if they were drinking one or more standard drinks per month.
‡A patient was described as a smoker if they were smoking one or more cigarettes per month.
BMI, body mass index; CROSSBAT, Combined Randomised and Observational Study of Surgery for type B Ankle fracture Treatment; TAFE, Technical and Further Education.