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You conduct a cohort study to examine whether using laptops is a risk factor for developing back pain among undergraduates. You enroll 50 UCM first-year undergraduates who use laptops (the exposed group) and 50 first-year undergraduates who use only a desktop computer (the unexposed group). You follow each group for two years and assess the incidence of severe back pain in each group at the end of the two years. Assume that no one has back pain at the beginning and no one drops out of the study.You find that 7 people in the exposed group report severe back pain at the end of the study. 3 people in the unexposed group report back pain.
Calculate the cumulative incidence of back pain in the exposed group.
A. 42.9% or 429 per 1,000
B. 86.0% or 860 per 1,000
C. 20.0% or 200 per 1,000
D. 6.0% or 60 per 1,000
E. 14.0% or 140 per 1,000

Respuesta :

The answer is E. This is because you need to take the number of people from the exposed group who reported back pain which in this case is 7 and divide it by the total number of people in that group which was 50. 7 divided by 50= .14 or 14% or 140 per 1,000 people.
akposevictor

The cumulative incidence of back pain in the stated exposed group of students can be calculated and estimated as: E. 14.0% or 140 per 1,000

Cumulative incidence, which is also referred to as incidence proportion, refers to the estimated percentage or proportion of individuals that are likely to be have a disease during a given period of time.

Cumulative incidence can be used by researchers to predict the risk of a disease at a given time.

  • Cumulative incidence = number of new cases / total number of individuals in a population

Thus, in the case stated above,

  • Number of new cases = 7 individuals from the exposed group who reported having severe back pain
  • Total number of individuals in the population = 50 first-year undergraduates in the group

Cumulative Incidence = [tex]\frac{7}{50} = 0.14[/tex]

0.14 is equivalent to 140 per 1,000.

Therefore, the cumulative incidence of back pain in the stated exposed group of students can be calculated and estimated as: E. 14.0% or 140 per 1,000

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