Table 1.
Characteristics of risk prediction models identified in systematic review
| Model | Year | Country | Derivation cohort | Patients included in derivation cohort |
|---|---|---|---|---|
| Van Way et al.34 | 1982 | USA | Retrospective single‐centre | 476 patients who underwent appendicectomy; included children and adults, and both sexes* |
| Alvarado20 | 1986 | USA | Retrospective single‐centre |
305 patients presenting with abdominal pain; age range 4–80 years, 42% of patients were women |
| Izbicki et al.28 | 1992 | Germany | Retrospective single‐centre | 536 patients who underwent appendicectomy; included both sexes* |
| Eskelinen et al.25 | 1992 | Finland | Prospective multicentre | 1333 patients presenting with abdominal pain; mean age 38 years, 52 per cent of patients were women |
| Christian and Christian24 | 1992 | India | Prospective single‐centre | 58 patients presenting with abdominal pain; age range 10–56 years, 22% of patients were women |
| Modified Alvarado29 | 1994 | UK | n.a.† | n.a.† |
| Eskelinen et al.26 | 1994 | Finland | Prospective multicentre | 636 patients presenting with abdominal pain; included men only* |
| van der Broek et al.33 | 2002 | Holland | Prospective single‐centre | 577 patients presenting with abdominal pain; all patients aged above 10 years, 59% of patients were women |
| Birkhahn et al.22 | 2006 | USA | Prospective single‐centre | 439 patients presenting with abdominal pain; age range 3–93 years, 65% of patients were women |
| AIRS21 | 2008 | Sweden | Prospective multicentre |
316 patients presenting with abdominal pain; mean age 26 years, 54% of patients were women |
| RIPASA score23 | 2010 | Brunei | Retrospective single‐centre | 312 patients who underwent appendicectomy; mean age 26 years, 42% of patients were women |
| Ting et al.32 | 2010 | Taiwan | Retrospective single‐centre | 532 patients who underwent appendicectomy; 39% of patients were women* |
| AAS31 | 2014 | Finland | Prospective single‐centre | 725 patients presenting with abdominal pain; age range 16–97 years, 58% of patients were women |
| Goh27 | 2017 | China | n.a.† | n.a.† |
| Mikaere et al.30 | 2018 | New Zealand | Retrospective single‐centre | 885 patients presenting with abdominal pain; all patients aged over 15 years, 59% of patients were women |
*
Overall age and/or sex information not reported.
†
Not applicable (n.a.) as modification of a previously published score (no derivation cohort). AIRS, Appendicitis Inflammatory Response Score; RIPASA, Raja Isteri Pengiran Anak Saleha Appendicitis; AAS, Adult Appendicitis Score.