On average,10% of the men and women followed were found to have lost （lose）some cognitive horsepower in the study's 5-year span

(1)主语+ be found to have done sth 主语被发现已经做了某事

(2)主语+ be found to do sth 主语被发现将要去做某事

备注：用一般体表示动作发生在谓语动作之后，用完成体表示动作发生在谓语之前。