Suppose that we want to determine whether or not amount of light exposure is lin

Question

Suppose that we want to determine whether or not amount of light exposure is linked to depression. We identify 5,000 participants across the United States with no intention of moving to a different permanent residence within the next two years and classify them as living in an area with high or low light exposure. We exclude those who are experiencing depression symptoms at baseline. We then follow them up for two years and determine whether they have experienced depression since baseline. There were 1500 participants residing in low-light areas and 3500 participants living in high-light areas. Of those in low-light areas, 500 participants experienced depression, and of those in high-light areas, 500 participants experienced depression. Assume the exposure is low-light. Create a 2x2 table and calculate and interpret the odds ratio.

Explanation / Answer

Total 5000 participants across the United States are classified as living in an area with high or low light exposure to study whether the amount of light exposure is linked to depression or not.

There were 1500 participants residing in low-light areas and 3500 participants living in high light areas.

Of those in low-light areas, 500 participants experienced depression.

Of those in high-light areas, 500 participants experienced depression.

It is clear from the odds ratio from the above table that the participants living in low-light areas are more prone to depression, the ratio shows that 1 participants out of every 3 participants of low light areas experienced depression While in the high-light areas 1 participants out of every 7 participants experienced depression.

Light exposure/Depression Experience Depression Not Experience Depression Low-Light areas 500/1500=1/3=0.333 1000/1500=2/3=0.666 High-Light areas 500/3500=1/7=0.143 3000/3500=6/7=0.857

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