Retrospective study 當然無randomised control trial (RCT) 咁 strong
但學術研究好難一步到位
通常都係有case series/case control study,再有人有interest,就再做大scale啲 e.g. retrospective study/pilot study
真係見到個trend先會bid到funding做prospective study.
所以retrospective 不是無價值的,只係佢未係最strong咁啫
如果下下都要等到有RCT,我怕會等到超高齡啦
所以睇下你點睇啦