Table 6.

Distances from root to the maxillary sinus floor in different age groups

	$\overline{X}\pm S$(mm)
Age group (y)
16–23	0.79 ± 2.42a
24–35	1.94 ± 2.88b
36–45	3.28 ± 3.59c
46–55	3.65 ± 4.07c
56–	4.21 ± 3.57c

Different letters symbolize the statistic difference, p < 0.05, ANOVA test

Different superscript letter means different subsets which has magnificent statistic difference. The p-value between a and b is 0.000001 < 0.05; the p-value between a and c is 0.000000 < 0.05; the p-value between b and c is 0.000010 < 0.05