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Prediabetes and the treatment outcome of tuberculosis: A meta-analysis.

OBJECTIVES: Diabetes has been related to higher risk and poor prognosis of patients with tuberculosis, while the influence of prediabetes on the treatment outcome of patients with tuberculosis remains not determined. A meta-analysis was performed to evaluate the influence of prediabetes on treatment outcome of patients with tuberculosis.

METHODS: Relevant cohort studies were acquired through a search of Medline, Embase, and Web of Science databases. To minimise the influence of between-study heterogeneity, a randomised-effects model was used to pool the results.

RESULTS: Eight prospective cohort studies including 3001 patients with tuberculosis were available for the meta-analysis. Among them, 752 (25.1%) were with prediabetes at baseline, and the patients were followed for a mean duration of 17.7 months. It was shown that compared to patients with normoglycemia, those with prediabetes were associated with a higher incidence of unfavourable treatment outcome (risk ratio [RR]: 1.41, 95% confidence interval [CI]: 1.02 to 1.96, p = 0.04; I2  = 56%). Subgroup analysis did not support that difference in study country (Asian or non-Asian), diagnosis (pulmonary tuberculosis only or also with extrapulmonary tuberculosis), mean age, follow-up duration, or study quality score had significant influence on the results (p for subgroup difference all >0.05). However, prediabetes at baseline was not associated with an increased risk of all-cause mortality during follow-up (RR: 1.59, 95% CI: 0.75 to 3.38, p = 0.23; I2  = 54%).

CONCLUSIONS: Patients with tuberculosis and prediabetes may have a higher risk of unfavourable treatment outcome compared to patients with normoglycemia.

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