For this assessment you are required to performe some epidemiology calculations and answer questions on a research articles in relation to study design and interpretation of results.

63916 assignment
Health care & others
Part A:
Part B:
Prevalence:
1. To calculate  prevalence, researchers randomly select a sample from the entire population they want to calculate ...
2. For this sample, prevalence is the number of people in the sample with the characteristic of interest, divided by the total number of people in the sample.
Hence using the above we calculate as:
2) Cumulative incidence is frequently referred to as a 'rate', but it really is the proportion of people who develop the outcome during a fixed block of time
In this case we find that during the 5 years 4 people have developed.
So cumulative incidence = 4/96 = 0.0417
3) Incidence density per year=4/5=0.80 per 1000 population
4) In this case original people affected = 6
No of people surveyed 96
Less: people died 4
Less: people lost to follow up 3
So out of 96, we have number 89
People affected by silicosis 10
So incidence rate = 10/89 = 0.1124
Part C
Journal article
1. As per article given, the investigator did not assign any exposures. He just recorded the dietary intakes of large sample by questionnaires. So this
Is observational study design.
In this, comparison of two groups were done, for analyzing the outcome from exposure. Hence this is a cohort study of observational study design.
This is general study design.
And here our design is as follows:
This is cohort study from observational study which measures outcome from exposure.
2. Strengths were
a) Sample size was very large thus sample can be taken as to represent the whole population.
b)...