Table 2 Characteristics of the studies included in the meta-analysis
References | Timing | Inclusion criteria | Number of patients | Prevalence appendicitis (%) | Proportion perforated (%) | Country | |
|---|---|---|---|---|---|---|---|
Total | Operated | ||||||
[16] | Pro | Suspected acute appendicitis | 229 | 129 | 33.2 | 39.5 | Sweden |
[17] | Pro | Suspected acute appendicitis | 428 | 206 | 41.4 | 38.4 | Sweden |
[18] | Pro | Suspected acute appendicitis, age > 5y | 3878 | 1598 | 39.8 | 46.9 | Sweden |
[19] | Retro | Acute appendectomy, pregnant | 53 | 53 | 75.5 | ? | Turkey |
[20] | Pro | Suspected acute appendicitis, age 16–45 | 5345 | 1957 | 27.4 | ? | UK |
[21] | Pro | Suspected acute appendicitis, age 15–70, unclear sampling | 89 | 89 | 78.7 | ? | Mexico |
[22] | Pro | Acute appendectomy, age > 12 | 107 | 107 | 84.1 | ? | India |
[23] | Pro | Suspected acute appendicitis | 941 | 435 | 36.8 | 29.5 | Netherlands |
[24] | Pro | Suspected acute appendicitis, age > 16, unclear sampling | 100 | 76 | 68.0 | ? | Egypt |
[25] | Retro | Acute appendectomy | 424 | 424 | 74.3 | 30.2 | N Zealand |
[26] | Pro | Suspected acute appendicitis, age > 16 | 245 | 198 | 71.8 | 46.6 | Malaysia |
[27] | Pro | Suspected acute appendicitis | 300 | 242 | 38.7 | 24.1 | India |
Pro | Suspected acute appendicitis, age < 15 | 318 | 150 | 47.5 | 50.3 | Sweden | |
[30] | Retro | Acute appendectomy | 73 | 73 | 80.8 | 13.6 | UK |
[31] | Pro | Acute appendectomy | 130 | 130 | 89.2 | 11.2 | India |
[32] | Retro | Acute appendectomy | 201 | 201 | 82.6 | 41.6 | Ireland |
[33] | Retro | Suspected acute appendicitis, pregnant, MRI | 255 | 29 | 10.2 | 11.5 | Israel |
[34] | Pro | Acute appendectomy, age > 18 | 328 | 328 | 86.6 | ? | Iraq |
[35] | Pro | Suspected acute appendicitis | 182 | 74 | 36.8 | 23.9 | Ireland |
[36] | Retro | Suspected acute appendicitis, pregnant, nested case‒control | 386 | 154 | 30.3 | 35.0 | Sweden |
[37] | Pro | Acute appendectomy, stratified random | 100 | 100 | 89.0 | ? | India |
[38] | Pro | Suspected acute appendicitis, age > 18 | 218 | 114 | 49.1 | ? | Turkey |
[39] | ? | Acute appendectomy, age > 18 | 120 | 120 | 85.8 | 22.3 | Iran |
[40] | Pro | Suspected acute appendicitis, age > 15 | 725 | 421 | 47.3 | ? | Finland |
[41] | Pro | Suspected acute appendicitis | 464 | 216 | 28.4 | 38.6 | UK |
[42] | Pro | Acute appendectomy | 60 | 60 | 88.3 | ? | India |