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Studying the Relationship Between Second Hand Smoke and Asthma

APSTAT-WXD7NW

A study was done to determine whether having a parent who smokes in the house has any effect on whether or not children develop asthma later in life.

Over a period of several years, the study followed the health records of $140$ children whose parent(s) smoked in the house and $140$ children whose parent(s) were non-smokers and compared the rates of asthma in these individuals at the age of $25$.

Which of the following BEST describes how the study was conducted?

A

This was an experiment with both a treatment group and a control group.

B

This was a comparative experiment using block design.

C

This was an experiment conducted without the use of blinding.

D

This was a long-term observational study.

E

This was a survey.