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Table II. United States projected year 2000 standard population and proportion distribution, by age, for age-adjusting death<br />

rates prior to 2001<br />

Proportion<br />

distribution<br />

Standard<br />

Age Population (weight) million<br />

Total . ................................ 274,634,000 1.000000 1,000,000<br />

Under 1 year ........................... 3,795,000 0.013818 13,818<br />

1–4 years ............................. 15,192,000 0.055317 55,317<br />

5–14 years ............................ 39,977,000 0.145565 145,565<br />

15–24 years. . .......................... 38,077,000 0.138646 138,646<br />

25–34 years. . .......................... 37,233,000 0.135573 135,573<br />

35–44 years. . .......................... 44,659,000 0.162613 162,613<br />

45–54 years. . .......................... 37,030,000 0.134834 134,834<br />

55–64 years. . .......................... 23,961,000 0.087247 87,247<br />

65–74 years. . .......................... 18,136,000 0.066037 66,037<br />

75–84 years. . .......................... 12,315,000<br />

1 0.044842 44,842<br />

85 years and over. . . ..................... 4,259,000 0.015508 15,508<br />

1 Figure is rounded up instead of down to force total to 1.0.<br />

SOURCE: CDC/NCHS. Anderson RN, Rosenberg HM. Age standardization of death rates: Implementation of the year 2000 standard.<br />

National vital statistics reports; vol 47 no 3. Hyattsville, MD: NCHS; 1998. Available from: http://www.cdc.gov/nchs/data/nvsr/nvsr47/<br />

nvs47_03.pdf.<br />

result from age differences in population composition.<br />

Age-adjusted rates should be viewed as relative indexes<br />

rather than actual measures of risk.<br />

Age-adjusted rates are calculated by the direct method, as<br />

follows:<br />

where<br />

n<br />

∑ r i ×(p i /P)<br />

i= 1<br />

r i = rate in age group i in the population<br />

of interest<br />

p i = standard population in age group i<br />

n<br />

P= ∑ p i<br />

i= 1<br />

n = total number of age groups over the age<br />

range of the age-adjusted rate.<br />

Age adjustment by the direct method requires the use of a<br />

standard age distribution. The standard for age-adjusting<br />

death rates and estimates from surveys in Health, United<br />

States is the projected year 2000 U.S. resident population.<br />

Starting with Health, United States, 2000, the projected year<br />

2000 U.S. standard population replaced the 1970 civilian<br />

noninstitutionalized population for age-adjusting estimates<br />

from most NCHS surveys; and starting with Health, United<br />

States, 2001, it was used uniformly and replaced the 1940<br />

U.S. population for age-adjusting mortality statistics and the<br />

1980 U.S. resident population, which previously had been<br />

used for age-adjusting estimates from the National Health<br />

and Nutrition Examination Survey.<br />

Changing the standard population has implications for racial<br />

and ethnic differentials in mortality. For example, the<br />

mortality ratio for the black to white populations is reduced<br />

from 1.6 using the 1940 standard to 1.4 using the 2000<br />

standard, reflecting the greater weight the 2000 standard<br />

gives to the older population, in which race differentials in<br />

mortality are smaller.<br />

Age-adjusted estimates from any data source presented in<br />

Health, United States that use the projected year 2000 U.S.<br />

resident population may differ from age-adjusted estimates<br />

based on the same data presented in other reports if<br />

different age groups are used in the adjustment procedure.<br />

For more information on implementing the 2000 population<br />

standard for age-adjusting death rates, see: Anderson RN,<br />

Rosenberg HM. Age standardization of death rates:<br />

Implementation of the year 2000 standard. National vital<br />

statistics reports; vol 47 no 3. Hyattsville, MD: NCHS; 1998.<br />

Available from: http://www.cdc.gov/nchs/data/nvsr/nvsr47/<br />

nvs47_03.pdf. For more information on the derivation of<br />

age-adjustment weights for use with NCHS survey data, see:<br />

Klein RJ, Schoenborn CA. Age adjustment using the 2000<br />

projected U.S. population. Healthy People 2010 statistical<br />

notes, no 20. Hyattsville, MD: NCHS; 2001. Available from:<br />

http://www.cdc.gov/nchs/data/statnt/statnt20.pdf.The<br />

projected year 2000 U.S. standard population is available<br />

from the National Cancer Institute's Surveillance,<br />

Epidemiology, and End Results (SEER) Program: http://<br />

seer.cancer.gov/stdpopulations/stdpop.singleages.html.<br />

Mortality data—Death rates are age-adjusted to the<br />

projected year 2000 U.S. standard population (Table I).<br />

Prior to 2001 data, age-adjusted rates were calculated<br />

using standard million proportions based on rounded<br />

population numbers (Table II). Starting with 2001 data,<br />

unrounded population numbers are used to age-adjust.<br />

Adjustment is based on 11 age groups, with two<br />

exceptions. First, age-adjusted death rates for black<br />

396 Appendix II. Definitions and Methods Health, United States, 2014

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