Levothyroxine therapy and impaired clearance are the strongest contributors to small intestinal bacterial overgrowth: Results of a retrospective cohort study

Figure 1 Study flow chart. A total of 3715 hydrogen breath examinations was eligible; 1586 were excluded due to missing or insufficient clinical data. From the remaining 2129 records, 320 were excluded because of multiple breath tests in the same subject, so that a summary total of 1809 patients were included in our study. 175 (9.7%) showed SIBO in terms, while 1634 did not (90.3%). SIBO: Small intestinal bacterial overgrowth.