The prevalences of tricuspid and pulmonic regurgitation increased with age, reached the peak values at the age of 8-9 years of age, and decreased gradually afterwards.

• 三尖瓣、肺动脉瓣返流的发生率随年龄增长而增加，8-9岁时达高峰，随后渐下降；二尖瓣及主动脉瓣返流发生率随年龄改变不明显。