Calculate the Crude Incidence Rate of Moped Injuries for the Suburb - Medical Science Assignment Help

Assignment Task:

Task:

Question 1 [Total 6 marks]. In a suburb of Stockholm there were 21 cases of injury due to moped (motorised bicycle) accidents in one year, while in a city parish with the same average population size (80,000 people) only 9 such injuries occurred (see table).

No. of injuries and person-years by age and area Age Number of Injuries Number of person-years (years) Suburb City Suburb City 15-19 20 7 4,000 1,000 20+ 1 2 76,000 79,000 Total 21 9 80,000 80,000

a. Calculate the crude incidence rate of moped injuries for the suburb and the city parish, respectively. 3 marks

Note: could express this per 10,000 person-years etc. Whatever your choice, be consistent. Crude incidence rates: Suburb = 21 / 80,000 per year = 26.25 per 100,000 person-years City = 9 / 80,000 per year = 11.25 per 100,000 person-years

b. Calculate the age-specific incidence rates for the suburb and the city parish respectively. 3 marks Age 15-19 Suburb: 20 / 4,000 = 500 / 100,000 person-years City: 7 / 1,000 = 700 / 100,000 person-years Age 20+ Suburb: 1 / 76,000 = 1.3 per 100,000 person-years City: 2 / 79,000 = 2.5 per 100,000 person-years

c. Calculate an adjusted incidence rate for the city using the population distribution from the suburb. 5 marks

Question 2 [Total 4 marks]. Examine the table below. Deaths from stomach cancer (ICD 151 in Australian men aged 45 years or more Age group 1981 1992 45-64 239 187 65+ 617 546 Which age group has contributed most to the observed reduction in mortality:

a. In absolute terms? 2 marks 45-64 years: 239 - 187 = 52 less deaths 65+ years: 617 - 546 = 71 less deaths So, the age group 65+ has had a greater reduction in absolute numbers of deaths.

b. proportionally? 2 marks 45-64 years: 52 / 239 = 22% reduction 65+ years: 71 / 617 = 12% reduction So, the age group 45-64 has had a greater proportional reduction. (Assuming that the population size and age structure did not alter between these two periods)

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