Characteristics of articles assessed from three cardiovascular journals edited in the year 2012.

*9 studies not assessed (no quantitative results, simulation studies, case reports, narrative reviews).1(%) [95% CI (%)].Characteristics of articles assessed from three cardiovascular journals edited in the year 2012.*9项研究未被纳入评估（无定量结果、模拟研究、病例报告或叙述性综述）。1（%）[95%置信区间（Confidence Interval, CI）]。2012年出版的3种心血管期刊中经评估文章的特征。