Fig. 2From: Vitamin D and the promoter methylation of its metabolic pathway genes in association with the risk and prognosis of tuberculosisTime to sputum conversion in TB patients and cumulative methylation levels of genes in the vitamin D metabolic pathway. The cumulative methylation levels are categorized into three groups based on quartile. Hypomethylation, P0–P25. Moderate methylation, P25–P75. Hypermethylation, P75–P100Back to article page