Table 4.

Pearson correlation coefficients of quantitative determinants of corrected QT interval prolongation

Variable	Pearson r	p value
Age	0.159	0.013
Body mass index	− 0.091	0.172
Serum potassium	− 0.280	< 0.0001
Serum calcium	− 0.166	0.011
Serum magnesium	− 0.133	0.044
Creatinine	0.066	0.304
Total number of drugs	0.119	0.064
Number of QT-prolonging drugs	0.200	0.002