The size of the appendix can vary, but the average length of the appendix is 8-10 cm (range 2-20 cm) . The normal diameter of the appendix can be as high as 12.8 mm, and 91.5% of normal appendices are larger than 6 mm. Another study showed that the mean maximal diameter of a normal appendix was 8.19 mm±1.6 (SD) (range, 4.2–12.8 mm) . The diameter of the appendix usually ranges from 7 to 8 mm. The length of the normal appendix can vary from 20 to 200 mm, averaging 6-10 cm. There is no correlation between appendiceal length and age or body length.