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Trends in childhood asthma: NCHS data on prevalence, health care use and mortality

Trends in childhood asthma: NCHS data on prevalence, health care use and mortality. Susan Lukacs, DO, MSPH Lara Akinbami, MD Infant, Child and Women’s Health Studies Branch, NCHS, CDC. Asthma data available from NCHS data systems. Prevalence Health care utilization Ambulatory health care

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Trends in childhood asthma: NCHS data on prevalence, health care use and mortality

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  1. Trends in childhood asthma: NCHS data on prevalence, health care use and mortality Susan Lukacs, DO, MSPH Lara Akinbami, MD Infant, Child and Women’s Health Studies Branch, NCHS, CDC

  2. Asthma data available from NCHS data systems • Prevalence • Health care utilization • Ambulatory health care • Hospitalizations • Mortality

  3. Asthma prevalence

  4. National Health Interview Survey (NHIS) • Continuous multipurpose survey on health conditions, status and behavior • Representative sample of the noninstitutionalized civilian US population • Interviews in >40,000 households – no review of medical records • Parent or responsible adult answers in proxy for children under 18 years of age • Redesigned in 1997 – affected asthma estimates

  5. NHIS original and redesigned asthma questions

  6. Asthma prevalence, 1980-96, asthma lifetime diagnosis, current and asthma attack prevalence, 1997-2002: NHIS, children 0-17 years Asthma lifetime diagnosis Current asthma prevalence Asthma prevalence (4.3% per yr ) Asthma attack prevalence

  7. Other asthma indicators available from the NHIS • 2002 asthma module • School days missed (trend established prior to 1997) • Preventive medications • Given asthma management plan by doctor • Advised by doctor to change home environment • 1999 asthma module (different questions) • Wheezing severity • Use of OTC and prescription medications

  8. Average number school days a child with asthma missed per year, ages 5-17 years: NHIS 1980-2002 NHIS redesign * • Per child with asthma having > one asthma attack per year

  9. Indicators of asthma control among children with current asthma, 2002 NHIS asthma module

  10. Asthma hospitalizations

  11. Asthma hospitalizations for children 0-17 years, 1980-2002 National Hospital Discharge Survey (NHDS)

  12. Asthma mortality

  13. Mortality component of National Vital Statistics System (NVSS) • Death certificate data received by NCHS from 50 States and DC  can obtain State-level data • Coding system changed in 1999 from ICD-9 to ICD-10

  14. Asthma deaths, children 0-17 years, 1980-2000, NVSS ICD-9 ICD-10 ICD-9

  15. Race/ethnic disparities in the burden of childhood asthma • Healthy People 2010 overarching goal • Examining disparities in asthma can guide policy and program decisions • However, issues in categorizing by race • New OMB guidelines: single vs. multiple race • Ethnicity not consistently available in data systems that rely on abstraction from medical records

  16. Race/ethnic disparities in asthma attack prevalence, (1997-2001 annual average), NHIS Non-Hispanic black Non-Hispanic black children had 30% higher asthma attack prevalence than NH white children Non-Hispanic white Hispanic

  17. Race/ethnic disparities in asthma attack prevalence, (1997-2001 annual average), NHIS Puerto Rican Non-Hispanic black Non-Hispanic white Hispanic Mexican

  18. Racial disparities in asthma hospitalizations (2000-2002 annual average), NHDS Black Black children had 240% higher hospitalization rate than white children White

  19. Race/ethnic disparities in mortality (1999-2001 annual average), NVSS Non-Hispanic black Non-Hispanic black children had 350% higher asthma death rate than NH white children Non-Hispanic white Hispanic

  20. Summary on trends in childhood asthma • Prevalence, health care use, and mortality increased through the mid 1990s • Since the mid 1990s, prevalence, ambulatory health care use, hospitalization and death rates have plateaued • Minority children bear a higher asthma burden • Racial disparities are most pronounced for preventable outcomes, such as ER visits, hospitalization and death

  21. For additional information on asthma from the CDC • NCHS home page: http://www.cdc.gov/nchs/ • Asthma Health E stat: asthma prevalence, health care use and mortality for all ages in 2002 • Summary statistics from the NHIS for children, 2002 • National Center for Environmental Health: http://www.cdc.gov/nceh/airpollution/asthma/ • Behavioral Risk Factor Surveillance Survey: state level asthma prevalence for adults • Links to asthma-related reports in the Morbidity and Mortality Weekly Report, including the Asthma Surveillance Summary, 1980-1999

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