Depression is becoming increasingly common among Hong Kong university students. Suppose we plan to conduct an intervention that has been used in the U.S before but never in HK. It targets university students with moderate-level depression, and we hope to see whether it works or not. Shall we set a control group to compare the results?

Depression is becoming increasingly common among Hong Kong university students. Suppose we plan to conduct an intervention that has been used in the U.S before but never in HK. It targets university students with moderate-level depression, and we hope to see whether it works or not. Shall we set a control group to compare the results?