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Table 3 Descriptive statistics, results of Kruskal-Wallis and Mann-Whitney U tests for comparison between membrane thicknesses of different morphologies

From: Crestal endoscopic approach for evaluating sinus membrane elevation technique

Morphology Mean ± SD (mm) Median (range) P value Perforation rate (%)
Flat (n = 4) 2.12 ± 1.45 1.75 (0.8–4.20) 0.008* 0
Irregular (n = 4) 2.83 ± 1.64 2.95 (0.90–4.50) 16.67
Polyp (n = 4) 8.10 ± 1.64 7.75 (6.50–10.40) 0
  1. *Significant at P ≤ 0.05