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Table 3 The frequency distribution and percentage of the number of roots and root canals according to sex in the mandibular first molars

From: Prevalence of middle mesial canal and radix entomolaris of mandibular first permanent molars in a western Chinese population: an in vivo cone-beam computed tomographic study

  Number of roots Number of root canals
Two roots Three roots   Two root canals Three root canals Four root canals Five root canals  
Male (n/%) 345 (72.8%) 129 (27.2%) 474 (100.0%) 6 (1.3%) 256 (54.0%) 210 (44.3%) 2 (0.4%) 474 (100.0%)
Female (n/%) 549 (78.4%) 151 (21.6%) 700 (100.0%) 47 (6.7%) 407 (58.1%) 240 (34.3%) 6 (0.9%) 700 (100.0%)
  894 (76.1%)* 280 (23.9%)* 1174 (100.0%) 53 (4.5%)* 663 (56.5%) 450 (38.3%)* 8 (0.7%) 1174 (100.0%)
  1. *p < 0.05, chi-square test