Association of anti-tuberculosis drug concentrations in hair and treatment outcomes in MDR- and XDR-TB.

Univariate proportional hazards regression found suggestive evidence that higher drug concentrations in hair may be substantially associated with lower risk of poor treatment outcome (HR 0.60, 95% CI 0.27–1.34; p=0.21), although this had wide uncertainty and did not reach statistical significance ( table 2 ).

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