A cross sectional study is performed evaluating the relationship between hypertension and cardiovascular disease. The researchers only conducted the study among non-smokers. This is an example of controlling confounding through:

Stratification

Restriction

Matching

Adjustment

1B. Researchers conduct a study examining the association between problem alcohol use and depression. After collecting their data, they identify childhood trauma as a potential confounder. How can the researchers control for confounding of the association between depression and problem alcohol use by childhood trauma experience in the analysis phase of the study?

	Randomization
	Matching
	Restriction
	Stratification