Age adjustment issues in healthy people 2010
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Age Adjustment Issues in Healthy People 2010. John Aberle-Grasse, MPH National Center for Health Statistics. Calculation of age-adjusted rate. Age-adjusted rate = S i (m i *w si ) m i = d i / p i * 100,000 w si = standard population weight in age group i

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Age Adjustment Issues in Healthy People 2010

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Age adjustment issues in healthy people 2010

Age Adjustment Issues in Healthy People 2010

John Aberle-Grasse, MPH

National Center for Health Statistics


Calculation of age adjusted rate

Calculation of age-adjusted rate

  • Age-adjusted rate =

  • Si (mi*wsi)

  • mi = di / pi * 100,000

  • wsi = standard population weight in age group i

  • di = deaths in age group i

  • pi = population in age group i


Calculation of age adjusted rate1

Calculation of age-adjusted rate

  • Spreadsheet vs. “manual” calculation

  • NCHS continues to use “manual” method

  • Healthy People 2010 rate calculations are rounded/truncated to one decimal place

  • Weights are rounded/truncated to six places


Standard population a population based on some age distribution

Standard population- a population based on some age distribution

  • NCHS in the past

  • mortality data used 1940 standard

  • survey data used mostly 1970 & 1980 standard

  • NCHS now uses year 2000 US resident population as standard for all age adjustment


Standard population a population based on some age distribution1

Standard population- a population based on some age distribution

  • NCHS in the past

  • mortality data used 1940 standard

  • survey data used mostly 1970 & 1980 standard

  • NCHS now uses year 2000 US resident population as standard for all age adjustment

  • 2000-adjusted rates better reflect national demographics and current crude rates


Age adjustment issues in healthy people 2010

Crude and age adjusted death rates based on year 1940 and 2000 standard populations: United States, 1979-2000

2000 standard

crude rate

1940 standard


Standard population a population based on some age distribution2

Standard population- a population based on some age distribution

  • IMPORTANT REMINDER: Comparisons can only be made between rates calculated using the same standard population


Age adjustment in healthy people 2010

Age-adjustment inHealthy People 2010

  • Mortality data

  • Health outcomes, risk factors, and health services data


Diabetes prevalence by race ethnicity obj 5 3 1999

Diabetes prevalence by race/ethnicity (Obj. 5-3), 1999

Overall

Hispanic/

Latino

Asian/

Pacific Islander

Not-Hispanic

African American

Not-Hispanic

White

American Indian/

Alaska Native

Source: National Health Interview Survey (NHIS), CDC, NCHS.


Diabetes age specific rates 1999

Diabetes age specific rates, 1999

Source: National Health Interview Survey (NHIS), CDC, NCHS.


2000 census age distribution

2000 Census age distribution


Diabetes prevalence obj 5 3 1999

Diabetes prevalence (Obj. 5-3), 1999

Source: National Health Interview Survey (NHIS), CDC, NCHS.


Diabetes prevalence obj 5 3 19991

Diabetes prevalence (Obj. 5-3), 1999

Source: National Health Interview Survey (NHIS), CDC, NCHS.


Age adjustment in healthy people 20101

Age-adjustment inHealthy People 2010

  • Mortality data

  • Health outcomes, risk factors, and health services data

  • Main purposes:

    • Observe trends in populations over time

    • Monitor disparity between populations both at a point in time and over time


Standard population age distributions

Standard population- age distributions

  • Several different age groupings are used to age-adjust data from different sources


Age adjustment issues in healthy people 2010

Data systems Age distributions used


Standard population age distributions1

Standard population- age distributions

  • Several different age groupings are used to age-adjust data from different sources

  • Some data sources use fewer age groupings to stabilize the rates of less common events and smaller subpopulations (e.g. age groups for chronic disease)


Hispanics aged 2 years with diabetes who have seen a dentist in the past year obj 5 15

Hispanics aged 2+ years with diabetes who have seen a dentist in the past year (Obj. 5-15)

Age-adjusted

Crude

Source: National Health Interview Survey (NHIS), CDC, NCHS.


Age adjustment issues in healthy people 2010

Hispanics aged 2+ years with diabetes who have seen a dentist in the past year (Obj. 5-15)

Source: National Health Interview Survey (NHIS), CDC, NCHS.


Hispanics aged 2 years with diabetes who have seen a dentist in the past year obj 5 151

Hispanics aged 2+ years with diabetes who have seen a dentist in the past year (Obj. 5-15)

< 45 separate

< 45 combined

Crude

Source: National Health Interview Survey (NHIS), CDC, NCHS.


Some exceptions

Some exceptions

  • Data that are not age-adjusted

  • Maternal/Infant mortality

    (live births as denominator)

  • National Household Survey on Drug Abuse

  • Occupational injury and death

  • Fatality Analysis Reporting System

  • Census of Fatal Occupational Injuries


Some exceptions1

Some exceptions

  • When to be careful in age-adjusting

  • Age specific rates for a measure vary differently between two population groups


Age specific cancer death rates among females 1970 to 1995

Age specific cancer death rates among females, 1970 to 1995

1995

1970

Source: National Vital Statistics System, CDC, NCHS.


Female cancer death rates by age adjustment standard

Female cancer death rates, by age adjustment standard

Crude rate

2000 standard

population

1940 standard

population

Source: National Vital Statistics System, CDC, NCHS.


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