Gender, age, and concomitant diseases of melanosis coli in China: a multicenter study of 6,090 cases.

When the age stratification was simplified into three groups, <25, 25–59, and ≥60 years, the MC detection rates presented an increasing trend with increasing age, demonstrating a significant increase in patients older than 60 years of age, at 3.19% (3,211/100,568, P < 0.01) ( Table 2 ).

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