Treatment characteristics of patients with late recurrent TB*, California 1993–2007.

Definition of abbreviations: Ref = reference group; Unk = unknown or missing; Standard 4drug = initial treatment with standard four drug regimen (isoniazid, rifampin, pyrazinamide, ethambutol); Two-drug IR = initial treatment with isoniazid and rifampin only; DOT = directly observed therapy; SAT = self-administered therapy.*Characteristic present in the first episode of patients with late recurrent TB (see text for details).‡3-level variable comparison.