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Table 5 Types of the distance form root to the maxillary sinus floor for both gender

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

  Type of distance from root to maxillary sinus floor [n,(%)]
Gender Type I > (0.5 mm) Type II (≤ 0.05 mm) Type III (= 0 mm) Type IV (< 0 mm)
Female 268 (22.7) 25 (2.1) 133 (11.2) 19 (1.6)
Male 424 (35.8) 50 (4.2) 161 (13.7) 103 (8.7)
Total 692 (58.5) 75 (6.3) 294 (24.9)a 122 (10.3)b
  1. *p < 0.05, chi-square test
  2. aSignificant difference, p = 0.002 < 0.05
  3. bSignificant difference, p = 0.000000 < 0.05