Table 5. Comparison of distance to lingula from mandibular landmarks in different age groups.

Distance	Side	Age group (yr)				P-value
		10-19 (n=6)	20-29 (n=29)	30-39 (n=13)	≥40 (n=2)
OP-L (mm)	Right	10.06±2.89	8.80±2.65	9.02±2.95	8.46±2.31	0.496
	Left	9.98±2.93	8.62±2.53	8.79±2.72	8.41±2.05	0.414
	Both	10.02±2.86	8.71±2.53	8.91±2.80	8.43±2.16	0.44
IOR-L (mm)	Right	14.59±1.24	14.80±1.52	13.98±1.69	13.90±2.39	0.093
	Left	14.85±1.05ab	15.12±1.37a	14.24±1.53b	13.86±1.45b	0.008*
	Both	14.72±1.07ab	14.96±1.35a	14.11±1.50b	13.88±1.87b	0.019*

(OP-L: distance from occlusal plane to lingula, IOR-L: distance from internal oblique ridge to lingula)

^*P<0.05.

^abThe same characters were not significant by the least significant difference (LSD) test.

Values are presented as mean±standard deviation.