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Table 4 Frequency of occurrence of middle mesial (MM) canals in mandibular first molars in three age groups

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

  Age groups
A (< 30 years) B (30–50 years) C (> 50 years)
Teeth with MM, n (%) 10 (4.1%) 6 (1.4%) 1 (0.4%)
Teeth without MM, n (%) 231 (95.9%) 425 (98.6%) 226 (99.6%)
Total 241 431 227