What question did this study set out to answer?

To assess the correlation between the size of tuberculin reactions and the diagnosis of mycobacterial disease.

Does Size Matter? Utility of Size of Tuberculin Reactions for the Diagnosis of Mycobacterial Disease

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Randomized trial evaluates the role of tuberculin reaction size in diagnosing mycobacterial disease, revealing size's limited diagnostic value.

To assess the correlation between the size of tuberculin reactions and the diagnosis of mycobacterial disease.
Included 182 close contacts and 502 suspected TB patients who underwent tuberculin skin testing and chest radiography.
Diagnosis was based on comprehensive clinical, microbiological, histological, and radiographic information.
Of 529 test subjects, 68 had active TB; size of tuberculin reactions of 5 mm or larger significantly indicated active or inactive TB (p < 0.001).
Reactions less than 5 mm showed a lower likelihood of active or inactive disease, while reactions above 5 mm did not differ by diagnosis.

ZAHRANI et al. (2000) studied this question.

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Randomized trial evaluates the role of tuberculin reaction size in diagnosing mycobacterial disease, revealing size's limited diagnostic value.