Anthropometric and surgical characteristics
| Factor | Serratus block (n=49) | Paravertebral block (n=51) | Standardized difference |
| Age (years) | 55.0 (44.0–64.0) | 53.0 (41.5–61.5) | 0.21 |
| Height (cm) | 163.0 (158.0–169.0) | 164 (159.0–170.0) | 0.33 |
| Weight (kg) | 68.2 (61.4–79.5) | 73.6 (61.8–85.7) | 0.19 |
| Female sex | 49 (100%) | 48 (94.1%) | 0.35 |
| Bilateral procedure | 17 (34.7%) | 19 (38.0%) | 0.22 |
Data are presented as median (IQR) or number (percentage).
Test used: Cohen’s d was used to calculate the standardized difference between treatment groups. Differences larger than 0.392 were considered imbalanced.