Research suggests that there is a dose response relationship between physical activity levels and mental health. Suppose that the table shown below was developed using data from a 10-year cohort study. Participants were categorized based on their physical activity levels and followed over time to see if they developed a mental health disorder. The referent group were those who did not exercise.
Exposure Status |
Cases of Mental Health Disorders |
Person Years of Observation |
No exercise |
50 |
20,000 |
Occasional exercise |
20 |
18,000 |
Frequent exercise |
7 |
13,000 |
D. 2.5
Incidence rate of mental health disorders per 1000 person years of observation among the referent group(those who did not exercise which is 50)) .
Incidence rate per 1,000 = No. of new cases of a disease occuring in the population during a specified period of time / No. of persons who are at risk of developing the disease during that period of time. * 1,000
= 50 / 20000 * 1000
= 2.5
Therefore, incidence rate of mental health disorders per 1000 person years of observation among the referent group is 2.5
Research suggests that there is a dose response relationship between physical activity levels and mental health....
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