Epidemiology – Direct Standardization

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Epidemiology – Direct Standardization




Introduction: This assignment addresses competency 1: “Apply epidemiological methods to the breadth of settings and situations in public health practice”. It is one of several assignments that will be used to assess this competency (standardization, calculating measures, screening). You may submit the assignment as a .pdf, word document, or excel spreadsheet, or enter the answers in the textbook. Please make it legible, and easy to understand.




Calculate and interpret crude and standardized mortality rates.

Table 1. Number of deaths of females and estimated mid-year population in Florida, 1997 by race

non-White females White females
(yrs) no. deaths est. mid-year pop. no. deaths est. mid-year pop.
<1 249 23,325 356 69,690
1-4 55 87,643 83 280,109
5-14 56 215,670 98 704,636
15-24 143 187,774 297 671,365
25-34 360 176,134 590 771,978
35-44 603 189,223 1,312 925,864
45-54 701 138,545 2,362 825,970
55-64 1,041 82,760 4,365 667,617
65-74 1,471 56,052 11,388 730,052
75-84 1,687 31,601 20,739 563,050
85+ 1,495 11,405 24,543 189,213

(1) What is the crude death rate for non-white females and for whites females?

Crude death rate per 1,000 for non-white females: _______________

Crude death rate per 1,000 for white females: ________________

Table 2. Age-specific death rates per 1,000 population among females.

non-White females White females
age-specific death rate age-specific death rate
Age group (yrs) per 1000 population per 1000 population

(2) What are the age-specific death rates per 1,000 population for each age group for non-white and white females?

Table 3. 1990 US Female Population by Age Group

Age group (yrs) 1990
US population
<1 1,928,000
1-4 7,231,000
5-14 17,124,000
15-24 18,098,000
25-34 21,596,000
35-44 18,925,000
45-54 12,824,000
55-64 11,158,000
65-74 10,139,000
75-84 6,267,000
85+ 2,180,000

(3) Using direct standardization, what is the age-adjusted rate per 1,000 among non-white and white females using the 1990 US female population as the standard?

Age-adjusted death rate per 1,000 for non-white females: _______________

Age-adjusted death rate per 1,000 for white females: ________________

(4) Compare and interpret the crude and adjusted rates. Which rates – crude or adjusted- should be used for comparison? Why? Write a statement of the findings for a lay audience.

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