Refer to the following table showing postmenopausal hormone use and coronary heart disease with selected exposure categories.

Coronary heart diseasePerson-years

Postmenopausal hormone use

Ever use3054,308.7

Past use1924,386.7

Current use1129,922.0

Never use6051,477.5

1.What is the risk of coronary heart disease among ever users of postmenopausal hormones?

2.Use the appropriate statistic to measure the strength of the association between ever versus never use. Interpret.

3.Use the appropriate statistic to measure the strength of the association between past versus never use. Interpret.

4.Use the appropriate statistic to measure the strength of the association between current versus never use. Interpret.