Determine What Type of Observational Study Is Described

question 63

Multiple Choice

Determine what type of observational study is described. Explain.
-Researchers wanted to determine whether there was an association between city driving and stomach ulcers.They selected a sample of 900 young adults and followed them for a twenty-year period. At the start of thestudy none of the participants was suffering from a stomach ulcer. Each person kept track of the number ofhours per week they spent driving in city traffic. At the end of the study each participant underwent tests todetermine whether they were suffering from a stomach ulcer. The researchers analyzed the results todetermine whether there was an association between city driving and stomach ulcers.

• A) cohort; Individuals are observed over a long period of time.
• B) cross-sectional; Information is collected at a specific point in time.
• C) retrospective; Individuals are asked to look back in time.

---

Definitions:

Ciliary Muscles

A ring of smooth muscle in the eye's middle layer that changes the lens shape for focusing.

Aqueous Humor

A clear, watery fluid located in the eye between the lens and the cornea, providing nutrients and maintaining pressure.

Vitreous Humor

A clear, gel-like substance that fills the space between the lens and the retina of the eye, helping it maintain its round shape.

Sebum

An oily substance produced by the sebaceous glands to moisturize and protect the skin.