Characteristics of pulmonary tuberculosis cases among urban migrants and local residents in Songjiang district, Shanghai, 2006–2008.

No. = number, MDR = multi-drug resistance, OR = odds ratio; CI = confidence interval.aFor persons who had cavitation on the initial chest radiograph.bFor persons who had a drug susceptibility test result available.cDefined as a strain with susceptibility to four first-line drugs (isoniazid, rifampin, streptomycin, and ethambutol).dDefined as a strain with resistance to at least one of four first-line drugs (isoniazid, rifampin, streptomycin, and ethambutol).eDefined as a strain with resistance to at least isoniazid and rifampin.