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Table 6 Distances from root to the maxillary sinus floor in different age groups

From: CBCT evaluation of root canal morphology and anatomical relationship of root of maxillary second premolar to maxillary sinus in a western Chinese population

  \(\overline{X} \pm S\)(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
  1. Different letters symbolize the statistic difference, p < 0.05, ANOVA test
  2. 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