2.4 Statistical analysis
Continuous data are presented as mean and standard deviation (SD). Univariate and multivariate odds ratios for VT termination and acceleration were estimated. A multilevel logistic regression was applied to estimate the odds ratios since VT episodes were nested within individuals. The multivariate model included RR interval variability of VTs (regular or irregular), average VT rate (beats per minute [bpm]), sex, ischemic cardiomyopathy, and use of an antiarrhythmic drug, β-blocker, angiotensin-converting enzyme inhibitor (ACE-I), or angiotensin II receptor blocker (ARB). Statistical analysis was performed using STATA version 16 (StataCorp LP, College Station, TX, USA). The level of statistical significance was set at p < 0.05.