Characteristics of included patients
| Patient characteristics | Total, n=104 | Successful NOT at 2 years, n=89 | Failed NOT at 2 years, n=15 | P value |
| Median age, years (IQR) | 10 (8–11) | 9 (8–11) | 10 (8–11) | 0.12 |
| Median duration of symptoms, days (IQR) | 1 (1–2) | 1 (1–2) | 2 (1–3) | 0.046 |
| Median weight, kg (IQR) | 32 (26–41) | 32 (26–41) | 32 (27–36) | 1 |
| Median maximal body temperature, °C (IQR) | 37.5 (37.2–37.9) | 37.5 (37.2–37.8) | 37.3 (37.2–37.9) | 0.1 |
| Median neutrophils, cell/µL (IQR) | 8.6 (5.3–12) | 8.6 (5.3–11.5) | 10.3 (4.2–15.7) | 0.56 |
| Median CRP, mg/L (IQR) | 11.3 (3.4–24.3) | 10 (3–21.4) | 21 (14.4–30) | 0.09 |
| Median ultrasound appendix diameter, mm (IQR) | 7.6 (7–9) | 7 (7–9) | 8 (7.2–9.5) | 0.02 |
| Median EPA at day 0 of hospitalisation, n (IQR) | 4 (0–5) | 3 (0–5) | 4 (3–7) | 0.19 |
| Median intravenous antibiotic duration, days (IQR) | 2 (2) | 2 (2–2) | 2 (2) | 1 |
| Median oral antibiotic duration, days (IQR) | 7 (7–7) | 7 (7–7) | 7 (7–7) | 0.2 |
| Median length of hospital stay, days (IQR) | 3 (3–4) | 3 (3–4) | 3 (3–4) | 0.94 |
The parameters measured and reported relate to the initial admission with appendicitis, not total during the follow-up period.
CRP, C reactive protein; EPA, electronic pain assessment; NOT, non-operative treatment .