Demographic and clinical characteristics of patients.

aAll patients were HIV negative.bAll patients received treatment from private medical practitioners. All patients (except patient 2) on diagnosis were initiated on category I treatment regimen as per the guidelines of the National TB programme but with no improvement in condition even after 1 year, they were started on second- and third- line anti-tubercular drugs.cIrregular Medication, treatment interrupted for more than a month for reasons due to patient.dRegular Medication, patient took regular prescribed medication as per the instructions of the private medical practitioner.eFirst-line agents, Isoniazid, Rifampin, Ethambutol, Pyrazinamide; Lfx, Levofloxacin; Mfx, Moxifloxacin; Km, Kanamycin; Ofx, Ofloxacin; Cm, Capreomycin;fCs, Cycloserine; Eto, Ethionamide; PAS, para-aminosalicylic acid; Clr, Clarithromycin; Lzd, Linezolid.gTreatment Failure, culture or AFB smear microscopy remaining positive or turning positive even after 6 months of treatment.