A cohort studied examined between the use of the mobile social application Grind

Question

A cohort studied examined between the use of the mobile social application Grinder and incidence of STIs among men. The men were followed for one year, and the following data was collected from 2000 males. 92 used Grindr and contracted an STI. 1280 did not use Grindr and did not contract an STI. 508 had used Grindr but did not contract an STI. Show ALL WORK

Construct a 2x2 table in the format below   

Calculate the sensitivity

Calculate the specificity

Calculate the incidence in exposed group

Calculate incidence in non-exposed group

Calculate the Odds Ratio for the data

Have the disease Do not have the disease Total Exposed Not Exposed Totals

Explanation / Answer

Sensitivity = No. of true positives / Total no. of people exposed to Grindr

= No. of people having the disease in the exposed group/ total no.of people in the exposed group

=92/600 = 0.15333

Specificity = No. of people in the non-exposed group identified as healthy/ total no. of people in the non-exposed group

= 1280/1400 = 0.9143

Incidence

Incidence in the exposed group = (No. of people having the disease in the exposed group) / (total no. of people exposed to the Grindr)

= 92/600 = 0.1533

incidence in the non-exposed group = (No. of people having the disease in non-exposed group) / (total no. of people in the non-exposed group)

= 120/1280 = 0.09375

Odds Ratio

Odds of exposure in those having the disease = a/c= 92/120 = 0.76666

Odds of exposure in those not having the disease= b/d = 508/1280 = 0.396875

Odds ratio = (a/c) / (b/d) = 0.76666/ 0.396875 = 1.9318

Have the disease Do not have the disease Total Exposed 92 508 600 Not exposed 120 1280 1400 Total 212 1788 2000

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