Figure 1. Relative risk of recurrent cardiac events in LQTS females using versus not using Oral contraceptive therapy in different LQTS subsets.
Abbreviations: LQTS: Long QT syndrome; LQT1: LQTS genotype 1; LQT2: LQTS genotype2; Events: total number of recurrent cardiac events (syncope or aborted cardiac arrest) at the end of follow-up; Pts: number of patients; QTc: first measurement recorded in LQTS Registry; Cardiac events: reflects the occurrence of cardiac events prior to menarche, HR: adjusted hazard ratios for variables described in the text, see Methods for more details; CI: confidence interval.