Injury episodes and circumstances: National Health Interview Survey, 1997-2007.

Background: The National Health Interview Survey (NHIS) provides estimates of nonfatal, medically attended injuries and poisonings occurring in the United States.

Objectives: The objectives of this report are to 1) document changes in the injury and poisoning section of NHIS from 1997 through 2007; 2) provide guidance on summarizing data across the 11-year study period; and 3) present detailed national estimates of nonfatal injury and poisoning episodes for the time period.

Data source: NHIS samples the civilian, noninstitutionalized population of the United States living in households. NHIS data from the years 1997-2007 were used in this report. Some questions related to injury and poisoning episodes were modified in 2000 and 2004.

Findings: During the period 1997-2004, many NHIS injury and poisoning questions were improved as a result of cognitive interviewing, data analysis, and feedback from interviewers and data users. Revisions to the NHIS injury and poisoning section pose some difficulties for trend analysis. However, some questions remained the same during the 11-year period, despite the questionnaire revisions. The injury and poisoning section has not been revised since 2004 and, where possible, analyses should be limited to 2004 and beyond. For analyses that require a longer time period, this report provides information on changes to questions and statistics that illustrate the effect of these changes on injury estimates. in 2007, the medically attended injury and poisoning episode rate among the U.S. civilian, noninstitutionalized population was 115.7 per 1,000 population. Despite differences in some questions during the period 1997-2007, NHIS data for these years show falls as the leading cause of injury and the home as the leading place that injury occurred.