In a cross-sectional study, the investigator measures the exposure and the outco
ID: 3004938 • Letter: I
Question
In a cross-sectional study, the investigator measures the exposure and the outcome at the same time in a sample of individuals. The following data are from a hypothetical cross-sectional study that tested the hypothesis that persons who engage in recreational physical activity are less likely to have trouble sleeping.
Trouble sleeping (% yes)
Recreational physical activity: Yes 20% No 40%
a) What conclusions can you draw from these results about the association between recreational physical activity and trouble sleeping? Please justify your answer.
Explanation / Answer
The above is data are from a hypothetical cross-sectional study that tested the hypothesis that persons who engage in recreational physical activity are less likely to have trouble sleeping
Conclusion is that there is no trouble in sleeping by doing physical activity
Because 20% people agree there is trouble in sleeping
But 40% people agree that there is no trouble in sleeping