Social, demographic, health care and co-morbidity predictors of tuberculosis mortality in Amazonas, Brazil: a multiple cause of death approach

Objectives Estimate TB mortality rates, catalogue multiple causes on death certificates in which TB was reported and identify predictors of TB from reporting on death certificates in the State of Amazonas, Brazil, based on a multiple cause of death approach. Methods The death records of residents in the Amazonas state between 2006-2014 were analyzed and separated into three categories: TB not reported on the death certificate (TBNoR), TB reported as the underlying cause of death (TBUC) and TB reported as an associated cause of death (TBAC). Age standardized annual mortality rates for TBUC, TBAC and with TB reported (TBUC plus TBAC) were estimated for the State of Amazonas using the direct standardization method and World Health Organization 2000-2025 standard population. Mortality odds ratios (OR) for reporting of TBUC and TBAC were estimated using multinomial logistic regression. Results Age standardized annual TBUC and TBAC mortality rates ranged between 5.9-7.8/105 and 2.7-4.0/105, respectively. TBUC was associated with being a resident in the State capital (OR = 0.66), of female gender (OR = 0.87), having an education level of 8 to 11, or 12 or more school years (OR = 0.67 and 0.50 respectively), non-white race/skin color (OR = 1.38) and place of death reported as in the State capital (OR = 1.69). TBAC was related to the triennium in which death occurred (OR = 1.21 and 1.22 for the years 2009-2011 and 2012-2014 respectively), age (OR = 36.1 and 16.5 for ages 15-39 and 40-64 years respectively) and when death occurred in the State capital (OR = 5.8). Conclusions TBUC was predominantly associated with predictors of unfavorable socioeconomic conditions and health care access constraints, whereas TBAC was mainly related to ages which were typical of high HIV disease incidence.