We included studies where the role of the persons delivering CB DOT was consistent with the definitions above for CHW or CV, independent of the term used in the study. Family members providing DOT for their relatives were not included in this definition of CHW or CV.
Treatment success was defined as the sum of cured patients and patients with completed treatment, using WHO definitions [21]. Loss to follow-up was defined as “a TB patient who did not start treatment or whose treatment was interrupted for two consecutive months or more” ([21], p. 6). In the absence of reporting of the numbers lost to follow-up, the reported number defaulting was used instead.