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Kaplan–Meier for cumulative risk of IBS in patients aged 14 and over stratified by Helicobacter pylori infection (HPI) with the log-rank test. Without HPI vs. With HPI, without medication: Log-rank P < 0.001. Without HPI vs. With HPI, with medication: Log-rank P = 0.479. With HPI, without medication vs. With HPI, with medication: Log-rank P < 0.001.
