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Lecture_4____rates_and_composition_student

# Lecture_4____rates_and_composition_student - September 9...

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September 9, 2009 Rates and Population Composition

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Rates: Making comparisons over time, place, or groups Crude rates Specific rates – e.g., age-specific rates Adjusted or Standardized Rates Total rates
General Formula for Crude Rates Crude Rate = (E/P)*k Where: E is the # of events to residents of a specific geographic location (e.g., state, country, county) over some accounting period (usually a year); P is the total population (or “population at risk”) for same geographic area (using mid-year pop); k is some constant (usually 1,000 or 100,000)

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Example 1: Crude Death Rate CDR = (D/P)*1,000 147,615 total deaths in NY in 2006 19,306,183 = 2006 NY mid-year population • CDR NY = (147,615/19,306,183)*1,000 = 7.6 deaths per 1,000 population
Example 2: Crude Birth Rate CBR = (B/P)*1,000 250,104 total births in NY in 2006 19,306,183 = 2006 NY mid-year population • CBR NY = (250,104/19,306,183)*1,000 = 13.0 births per 1,000 population

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CDRs and CBRs for US and Select States, 2006 Mid-year Population (July 1, 2006) Deaths Births CDR CBR U.S. 299,398,484 2,426,264 4,265,555 8.1 14.2 New York 19,306,183 147,615 250,104 7.6 13.0 California 36,457,549 236,452 562,440 6.5 15.4 S. Dakota 781,919 7,038 11,919 9.0 15.2 Utah 2,550,063 13,645 56,504 5.4 22.2 Florida 18,089,888 169,365 236,802 9.4 13.1 Data Sources: National Vital Statistics Reports, Vol. 57, No. 14, April 17, 2009
Poverty rates

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Violent Crime Index base upon 100,000 People, Ithaca, NY Year Population Murd Rape Robbery Assault Total Violent Crimes 2005 29,995 0.0 13.3 100.0 146.7 260.0 2004 30,401 0.0 0.0 0.0 0.0 0.0 2003 30,025 0.0 0.0 20.0 13.3 33.3 2002 29,567 0.0 13.5 98.1 44.0 155.6 2001 29,341 3.4 20.4 68.2 47.7 139.7 2000 29,287 6.8 3.4 92.2 34.1 136.6 1995 29,188 0.0 17.1 164.5 58.2 239.8 1990 29,541 0.0 13.5 57.5 179.4 250.5 1985 28,611 3.5 28.0 45.4 209.7 286.6 1980 28,846 0.0 10.4 27.7 31.2 69.3
Select CDRs 2007 Highest: Swaziland: 30.4 Afghanistan: 20.0 US: 8.3 China: 7.0 Mexico: 4.8 Lowest: United Arab Emirates: 2.2 Data Source: U.S. Census International Programs Center.

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Select CBRs 2007 Highest: Niger: 50.2 Afghanistan: 46.2 US: 14.2 China: 13.4 Mexico: 20.4 Lowest: Hong Kong (China): 7.3 Data Source: U.S. Census International Programs Center.
Data Source: CDC/NCHS/VitalStats at statehealthfacts.org CBRs by State, 2006

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Where do crude rates come from? Numerator: Vital Statistics http://www.cdc.gov/nchs/births.htm Denominator: U.S. Census www.census.gov
Why are these rates “crude?”

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Population Composition Matters!
If crude, why use them?

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Lecture_4____rates_and_composition_student - September 9...

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