To investigate normal standard of QRS wave complex amplitude of healthy Chinese population in different ages and sexes, x ? s and percentile value of QRS wave complex amplitude of 4322 normal electrocardiographic waves were calculated.

• 为探讨国人不同年龄和性别心电图QRS波群复合振幅正常范围,计算4322例正常人群各年龄组QRS波群复合振幅(?)