Table 2.

Multivariate analysis of various factors for predicting severe corrected QT prolongation in 100 subarachnoid hemorrhage patients

Analyses	Relative risk (95% CI)	P
Analysis 1
Female sex	3.69 (1.27–10.73)	<0.02
Serum potassium (for each 1 mmol/l)	0.13 (0.04–0.43)	<0.001
Analysis 2
Female sex	4.45 (1.55–12.78)	<0.01
Hypokalemia (serum potassium <3.5 mmol/l)	4.53 (1.79–11.50)	<0.002

Potential prognostic factors were selected from Table 1. CI, confidence interval.