Age (year) Dimensions (mm)

≤20 (n = 133)

>20 (n = 867)

P value

Length

56.75 ± 13.87 mm

66.51 ± 14.06 mm

0.071

Width

21.62 ± 6.42 mm

22.54 ± 8.10 mm

0.760

Wall thickness

2.62 ± 1.31 mm

2.34 ± 0.67 mm

0.466