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Odds ratios for ventricular arrhythmias associated with a 0.5 g/m3 decrease in outdoor absolute humidity, Boston Implantable Cardioverter Defibrillator Study, 1995–2002. Odds ratios were estimated using separate models, adjusted for the 24 h moving average concentrations of particulate matter <2.5 μm in aerodynamic diameter (PM2.5) and ozone, and matched on month, day of the week, and hour. Bars, 95% confidence interval.
