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Table 2 Number and frequency of apical foramina in mandibular first molars according to sex

From: Cone-beam computed tomography analysis of root canal morphology in mandibular first molars in a Chinese population: a clinical study

Sex 1 (%) 2 (%) 3 (%) 4 (%) 5 (%) Kappa value P value
Female (469) 64 (13.6%) 260 (55.4%) 145 (30.9%) 1.5320 0.4649
Male (431) 70 (16.2%) 239 (55.5%) 122 (28.3%)
Total (900) 134 (14.9%) 499 (55.4%) 267 (29.7%)