Table 2.
Demographic and baseline characteristics of patients in the pre- and post-intervention groups
| Characteristics | Pre-intervention group (n=40) | Post-intervention* group (n=43) | Total (n=83) |
| Gender, n (%) | |||
| Male | 17 (42.5%) | 20 (46.5%) | 37 (44.6%) |
| Age (years) | 72.8 (63.2, 81.3) | 73.0 (54.7, 78.1) | 73.9 (58.7, 81.8) |
| Weight (kg) | 71.0 (55.2, 78.2) | 75.1 (68.0, 85.2) | 72.0 (60.4, 83.7) |
| Allergy, n (%) | |||
| Beta-lactam antibiotics | 1 (2.5%) | 3 (6.9%) | 4 (4.8%) |
| Lymphocyte count (x106/L) | |||
| Pre† | 1.2 (0.8, 1.8) | 1.9 (1.2, 2.3) | 1.45 (1.0, 2.3) |
| Post | 1 (0.8, 1.3) | 1.1 (0.9, 1.4) | 1.1 (0.8, 1.3) |
| Neutrophil count (x109/L) | |||
| Pre | 5.3 (3.6, 6.4) | 4.2 (3.3, 6.2) | 4.7 (3.4, 6.3) |
| Post | 6.6 (4.2, 8.4) | 6.7 (5.3, 8.6) | 6.6 (5.2, 8.6) |
| Patients with renal impairment n (%) | |||
| Mild (<50 mg/mL) |
5 (12.5%) | 4 (9.3%) | 9 (10.8%) |
| Moderate (<30 mg/mL) |
2 (5.0%) | 2 (4.6%) | 4 (4,8%) |
| Haemoglobin level (g/dL) | |||
| Pre | 12.1 (10.7, 14.3) | 13.4 (12.4, 14.8) | 13.1 (11.3, 14.5) |
| Post | 10.7 (9.6, 12.1) | 11.5 (10.2, 12.2) | 11.2 (9.8, 12.1) |
| Orthopaedic procedure, n (%) | |||
| Total knee replacement | 15 (37.5%) | 19 (44.2%) | 34 (41.0%) |
| Total hip replacement | 15 (37.5%) | 11 (25.6%) | 26 (31.3%) |
| Lower limb | 8 (20.0%) | 7 (16.3%) | 15 (18.1) |
| Spinal | 2 (5.0%) | 6 (13.9%) | 8 (9.6%) |
All values are expressed as median (IQR) unless stated otherwise.
*p>0.05; non-significant differences between groups in all variables collected.
†Pre, before surgery; post, after surgery.