Use of the vertebrae and iliac bone as references for localizing the appendix vermiformis in computed tomography

Table 2 Minimum, maximum, and mean ± standard deviation of appendix location in relation to the right iliac bone in the overall population, acute appendicitis group, and normal appendix group, mm

Groups	Ap0 (origin)	ApA (highest point of the appendix)	ApB (lowest point of the appendix)
Acute appendicitis group (n = 68)	(−) 34.1 ± 29.1; (−) 100.8 − (+) 44.2	(−) 17.1 ± 27.8; (−) 84.8 − (+) 48.3	(−) 60.9 ± 27.9; (−) 121.6 − (+) 39.1
Normal appendix group (n = 359)	(−) 42.3 ± 31.5; (−) 126.0 − (+) 40.1	(−) 24.2 ± 34.1; (−) 126.0 − (+) 87.4	(−) 59.8 ± 30.2; (−) 140.5 − (+) 44.1
Total (n = 427)	(−) 41.0 ± 32.7; (−) 126.0 − (+) 44.2	(−) 23.0 ± 30.8; (−) 126.0 − (+) 87.4	(−) 60.0 ± 30.2; (−) 140.5 − (+) 44.1

No statistically significant difference was found between the acute appendicitis and normal appendix groups in ApB location relative to the right iliac bone (P = 0.19). Significant difference was found between the acute appendicitis and normal appendix groups in Ap0 and ApA locations relative to the right iliac bone (P = 0.04 and P = 0.04; respectively).