観かん察さつ的てき研けん究きゅう

noun

observational study

A research method in which subjects are observed without intervention, commonly used in epidemiology and social sciences.

• この観かん察さつ的てき研けん究きゅうでは、参さん加か者しゃの生せい活かつ習しゅう慣かんを長ちょう期き間かん追つい跡せきした。

  In this observational study, the participants' lifestyle habits were tracked over a long period.