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Crude association between PPI use and risk of hypomagnesaemia stratified by subgroups of PPI use. No PPI, Low PPI dose (≤20 mg omeprazole Eq/day), High PPI dose (>20 mg omeprazole Eq/day). Presented are odds ratio’s with 95% confidence intervals. * P = 0.004; ** P < 0.001; Ptrend < 0.001.
