The household response rate for the NHIS data years 2005–2007 was 86.9%. This report is based on data from 79,096 completed interviews with sample adults aged 18 years and over. Among adults identified in interviewed households as eligible for the Sample Adult component, the combined (conditional) response rate was 80%. The final Sample Adult response rate for the 3 years combined, which takes into account both Family and Sample Adult interview nonresponse, was 69.2%. Procedures used in calculating response rates are described in detail in Appendix I of the Survey Description of the NHIS data files (35–37).