1. Suppose that the following 2x2 table represents the exposure and outcome distribution in a population of 1,000 SDSU students surveyed about e-cigarette use exposure and anxiety outcome on January 31, 2020.

	Anxiety	No Anxiety	Total
e-cigarette use	221	279	500
No e-cigarette use	100	400	500
Total	321	679	1,000

What is prevalence of e-cigarette use?

What is the prevalence of anxiety?

What is the prevalence of anxiety among those who reported using e-cigarettes?

What is the prevalence of anxiety among those who reported never using e-cigarettes?

Calculate the odds ratio.

Interpret the odds ratio.