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| Methods | Individual randomization. | |
| Participants | 7,036 men in U.S. VA hospitals; abnormal chest x‐ray. 98% men; mostly 30‐50 years old. 77% white. | |
| Interventions | Isoniazid 300 mg daily 1‐2 years. | |
| Outcomes | 1. Active tuberculosis | |
| Notes | Majority of this group had received previous TB medications and were excluded from analysis. 2,389 participants included. |
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