Table 10.
The frequencies of acute appendicitis diagnoses according to risk category in the whole study group
| Acute appendicitis | True appendicitis % |
CR (fold) |
||
|---|---|---|---|---|
| Yes | No | |||
| Alvarado (n) | 2395 | 915 | ||
| High (>8) | 336 (14.0) | 32 (3.5) | 91.3 | 1.93 |
| Intermediate (5–8) | 1787 (74.6) | 580 (63.3) | 75.5 | |
| Low (<5) | 272 (11.3) | 303 (33.1) | 47.3* | |
| AIR (n) | 2182 | 831 | ||
| High (>8) | 383 (17.5) | 57 (6.8) | 87.0 | 1.87 |
| Intermediate (5–8) | 1542 (70.6) | 480 (57.7) | 76.3 | |
| Low (<5) | 257 (11.7) | 294 (35.3) | 46.6* | |
| RIPASA (n) | 2314 | 887 | ||
| Definite (≥12) | 419 (18.1) | 41 (4.6) | 91.1 | 3.88 |
| High (7.5–11.5) | 1456 (62.9) | 338 (38.1) | 81.2 | |
| Low (5–7) | 408 (17.6) | 407 (45.8) | 50.1 | |
| Unlikely (<5) | 31 (1.3) | 101 (11.3) | 23.5* | |
| AAS (n) | 2236 | 874 | ||
| High (≥16) | 1161 (51.9) | 178 (20.3) | 86.7 | 2.61 |
| Intermediate (11–15) | 950 (42.4) | 444 (50.8) | 68.1 | |
| Low (0–10) | 125 (5.6) | 252 (28.8) | 33.2* | |
Values are n (%) unless otherwise indicated. CR was calculated by dividing the appendicitis percentage in the highest risk category by the percentage in the lowest risk category (true positive rate/failure rate). Percentages in parentheses are row percentages, showing the distribution of patients in each risk category. *Corresponds to failure rate. CR, categorization resolution; AIR, Appendicitis Inflammatory Response; RIPASA, Raja Isteri Pengiran Anak Saleha Appendicitis; AAS, Adult Appendicitis Score.