General characteristics and echocardiographic parameters of the ER, control 1 and 2 groups.

ER, early repolarization syndrome;
* P < 0.05, compared with QTd in the control 1 or Control 2 group.
# P < 0.01, compared with the short axis value.
Control 2 group: age-and gender- matching patients from control1 group with ER group.
General characteristics and echocardiographic parameters of the ER, control 1 and 2 groups.

ER：早期复极综合征（early repolarization syndrome）；
* P < 0.05，与对照组1或对照组2的QT离散度（QTd）相比；
# P < 0.01，与短轴测量值相比；
对照组2：与ER组患者年龄、性别相匹配的对照组1受试者；
ER组、对照组1及对照组2的一般特征与超声心动图参数。