Pooled risk differences from direct head-to-head comparisons of rifampin duration or intermittent schedules in otherwise comparable regimens: Failure.

Seventeen head-to-head comparisons of rifampin duration. For one study [54],[55], results with 9-, 12-, and 18-mo regimens were the same so they were combined.aRegimen abbreviations: H, isoniazid; R, rifampin; Z, pyrazinamide; E, ethambutol; S, streptomycin.Letters to left of ��/�� indicate regimen in initial intensive phase; letters to right of ��/�� indicate regimen in continuation phase. First number signifies the months of initial phase of treatment and the second number signifies the months of continuation phase treatment. [ ] indicates intermittent therapy; subscript number after [ ] indicates number of doses per week.