TABLE 2.
Baseline characteristics.
| Non-invasive (n = 29) |
Invasive (n = 41) |
p-value | |
| Male gender | 16 (44.8%) | 24 (58.5%) | 0.258 |
| Age (years)^ | 9.3 ± 3.8 | 10.2 ± 4.0 | 0.338 |
| Appendicitis severity | 1.0 | ||
| - Simple | 4 (14%) | 6 (15%) | |
| - Complex | 25 (86%) | 33 (80%) | |
| - Missing | 0 | 2 | |
| Surgical approach | 0.045 | ||
| - Laparoscopic | 17 (59%) | 33 (80%) | |
| - Open | 11 (38%) | 7 (17%) | |
| - Missing | 1 | 1 | |
| Time after appendectomy (days)* | 9 (6.5–13) | 9 (6–12.5) | 0.957 |
| Temperature at diagnosis PAA | 37.6 (37.1–38.3) | 37.7 (37.1–38.6) | 0.496 |
| Leukocytes at diagnosis PAA (x109/L)* | 17.3 (14.0–24.3) | 18.0 (15.0–22.2) | 0.760 |
| CRP at diagnosis PAA (g/dL)* | 105 (74–191) | 154 (83–216) | 0.458 |
| PAA size | <0.001 | ||
| - Small (< 3 cm) | 7 (24%) | 1 (2%) | |
| - Medium (3–6 cm) | 15 (52%) | 12 (29%) | |
| - Large (>6 cm) | 3 (10%) | 16 (39%) | |
| - Multiple | 3 (10%) | 11 (27%) | |
| - Missing | 1 | 1 | |
| PAA location | 0.155 | ||
| - RLQ | 14 (48%) | 15 (37%) | |
| - RUQ | 4 (14%) | 2 (5%) | |
| - Douglas space | 6 (21%) | 13 (32%) | |
| - LLQ | 1 (3%) | – | |
| - LUQ | 1 (3%) | – | |
| - Multiple | 3 (10%) | 11 (27%) |
* Median (IQR).
∧Mean and standard deviation.