Variable | Preweighting sample | P value | Postweighting sample | P value | ||
Non-operative treatment, n | Direct appendectomy, n | Non-operative treatment, n | Direct appendectomy, n | |||
Age, n (%) | ||||||
0–5 | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
6–11 | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
12–17 | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Sex, n (%) | ||||||
Female | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Male | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
BMI | Mean (SD) | Mean (SD) | p=0.XX | Mean (SD) | Mean (SD) | p=0.XX |
Comorbidities, n (%) | ||||||
Abdominal surgery | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Abdominal (non-surgical) | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Cardiopulmonary | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Neurological | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Metabolical | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Nefro/urological | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Endocrinological | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Musculoskeletal | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Other | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
ASA score, n (%) | ||||||
ASA I | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
ASA II | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
ASA III | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
ASA IV | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
ASA V | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Preoperative SIRS, n (%) | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Complex appendicitis prediction score | Mean (SD) | Mean (SD) | p=0.XX | Mean (SD) | Mean (SD) | p=0.XX |
Preference for treatment strategy | ||||||
Surgeon | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Parent(s) | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Patient | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Preoperative imaging, n (%) | ||||||
US | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
US+MRI | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
US+CT | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Abscess on imaging, n (%) | ||||||
<3 cm | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
3–6 cm | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
>6 cm | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Multiple | N (% of total) N (% of total) | N (% of total) N (% of total) | p=0.XX p=0.XX | N (% of total) N (% of total) | N (% of total) N (% of total) | p=0.XX p=0.XX |
Hospital, n (%) | ||||||
Academic | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Teaching | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Non-teaching | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Daytime presentation, n (%) | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Weekend presentation, n (%) | N (% of total) | N (% of total) | p=0.XX | N (% of total) | N (% of total) | p=0.XX |
Days of abdominal pain | Median (IQR) | Median (IQR) | p=0.XX | Median (IQR) | Median (IQR) | p=0.XX |
ASA, American Society of Anesthesiologists; BMI, body mass index; SIRS, Systemic Inflammatory Response Syndrome.