“…However, an observed odds ratio for those who live in regions with a higher percentage of households without water supply was meaningless contrary to what was expected. This finding contradicts publications, which emphasized greater TB morbidity in houses without water supply (CANTWELL et al, 1998;DYE et al, 2009;PEREIRA et al, 2015;PEDRO et al, 2017;SILVA et al, 2018) and may be linked to Luis David Castiel called an ecological fallacy (cross-level bias),a phenomenon of imbalance where, in an analysis of aggregated data -as adopted in this study, a result is generated that seems paradoxical but, in a more detailed analysis, it appears plausible at the individual level (CASTIEL, 1998).…”