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Weighted empirical cumulative distributions (ECDF) for serum methylmalonic acid concentrations in US persons ≥20 y of age who are vitamin B-12 replete and have normal renal function by age group, NHANES 2011–2014. Black solid line: 20–39 y (n = 2,178); grey solid line: 40–59 y (n = 1,988); large dashed line: 60–69 y (n = 824); small dashed line: ≥70 y (n = 491).
