|
|
|
|
|
|
|
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
About This Release Early
Release of Selected Estimates Based on Data From the January-June 2002 National
Health Interview Survey In this release, the Early Release Program of the Centers for Disease Control's National Center for Health Statistics (NCHS) provides updated estimates for 12 selected health measures based on new data from the January-June 2002 National Health Interview Survey (NHIS), with comparisons to estimates from the NHIS back to 1997. In addition, a new measure, prevalence of serious psychological distress among U.S. adults, has been added in section 13. The 13 early release measures are being published prior to final data editing and final weighting to provide access to the most recent information from the NHIS. The 13 measures included are health insurance coverage (including lack of health insurance and type of coverage), usual place to go for medical care, obtaining needed medical care, influenza vaccination, pneumococcal vaccination, obesity, leisure-time physical activity, current smoking, alcohol consumption, HIV testing, general health status, personal care needs, and serious psychological distress. A new measure, prevalence of serious psychological distress, is estimated using six questions in the Sample Adult Core component of the NHIS that ask how often a respondent experienced symptoms of psychological distress during the past 30 days. The response codes (0-4) of the six items for each person are summed to yield a scale with a 0-24 range. A value of 13 or more for this scale is used here to define serious psychological distress.(1) For each selected health measure, a graph is presented that shows the trend over time, from 1997 through June 2002, for the total population. It is followed by graphs and tables showing estimates by sex, age group, and race/ethnicity based on data from the January-June 2002 NHIS. Key findings are highlighted with bulleted text. Data tables providing values displayed in the graphs are included at the end of each section. This release also provides updates for age-adjusted estimates for those early release measures that are also Healthy People 2010 leading health indicators (lack of health insurance, usual place to go for medical care, influenza vaccination, pneumococcal vaccination, obesity, leisure-time physical activity, and current smoking)(2). Data source: The data are derived from three components of the 2002 NHIS (January-June): the Family Core questionnaire, which collects information on all family members (data for 47,189 persons); the Sample Adult Core questionnaire, which collects information from one randomly selected adult aged 18 years or over in each family in the NHIS (data for 15,705 adults); and the Sample Child Core questionnaire, which collects information about one randomly selected child in each family with a child in the NHIS (data for 6,338 children). Visit the NHIS Web site for more information on the design, content, and use of the NHIS. Estimation procedures: Using population totals provided by the U.S. Census Bureau, sample weights were calculated to provide national estimates for the noninstitutionalized civilian population and to adjust for nonresponse. NCHS creates weights for each calendar quarter of the NHIS sample. The NHIS data weighting procedure has been described in more detail elsewhere (view/download PDF). Because the estimates for the year 2002 are being released prior to final data editing and final weighting, they should be considered preliminary and may differ slightly from estimates made later using the final data files. The estimates from the 1997-2001 NHIS were derived from the final data files for those years (except for health insurance coverage; see that section for details). A public use file for the 2001 NHIS was just released in December 2002. For the NHIS announcements and more detailed information, check the NHIS Web site. Point estimates and estimates of their variances were calculated using the SUDAAN software package to account for the complex sample design of the NHIS. The Taylor series linearization method was chosen for variance estimation. All estimates shown meet the NCHS standard of having less than 30% relative standard error. Point estimates in some figures are shown with 95% confidence intervals. Differences between percents or rates were evaluated using two-sided significance tests at the 0.05 level. Terms such as "greater than" and "less than" indicate a statistically significant difference. Terms such as "similar" and "no difference" indicate that the statistics being compared were not significantly different. Lack of comments regarding the difference between any two statistics does not necessarily mean that the difference was tested and found to be not significant. When appropriate for comparison purposes, direct standardization was used to calculate age-sex-adjusted or age-adjusted percents using the 2000 U.S. standard population. The age groups used varied depending upon the impact of age on specific measures. Rates presented are crude rates unless otherwise stated. Future plans for early release of NHIS estimates: The NCHS Early Release Program will update and release estimates 6 months after NHIS data collection has been completed for each quarter. These releases are tentatively scheduled for March, June, September, and December. New measures may be added as work continues and in response to changing data needs. Feedback on the early release mechanism and on the estimates is welcome (e-mail). Announcements about early releases, new data releases, publications, or corrections related to the National Health Interview Survey (NHIS) will be sent to members of the HISUSERS Listserv. To join, visit the CDC Web site. Return to Early Release Measures
This page last reviewed
July 10, 2008
|
|
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
