Question

Classify the following study as: The Iowa Women's Health Study, in which researchers enrolled 41,837 women in 1986 and collected exposure and lifestyle information to assess the relationship between these factors and subsequent occurrence of cancer.

Answer 1

Cohort study

Step-by-step explanation:

A cohort study refers to a study that takes a sample of people who share a defining characteristic and repeats the gathering of information from the sample along some period of time.

In the case of the Iowa Women´s Health Study, researchers gathered information about women (in their 60's in 1986) and their use of vitamin and mineral supplements. These women reported their use of vitamins in 1986, 1997 and 2004 and researchers were trying to gather information on the use of this use and the rate of mortality in this group.

We can see that this women shared the characteristic of their age (they were all seniors), and the gathering of information was repeated 3 times in a period of 18 years. Therefore, these two characteristics make this a Cohort study.