METHODS: RDD telephone survey obtained a population-based sample of US adults aged 35 to 89 years. Blacks and older individuals were over-sampled. The four main instruments were administered in random order, followed by HALex, BRFSS QoL questions, scales of psychological well-being, and questions on 13 health conditions, demographics, SES and discrimination. Initial analyses used 1,262 interviews completed between June 2005 and February 2006. SF-36 responses were converted to SF-6D scores. Correlations were calculated, and mean scores for each index were computed by age group, sex and race. Analyses used survey weights to adjust to US population with SAS 8.02.
RESULTS: Correlations among measures were high, ranging from 0.61 to 0.87. EQ-5D (US weights) yielded the highest mean HRQoL summary scores, QWB-SA the lowest. HRQoL decreased with increasing age, with measures having approximately parallel slopes.
CONCLUSIONS: HRQoL estimates from these generic indices are highly correlated and show remarkably similar patterns when administered simultaneously and used to compute age-specific norms. By September 2006, approximately 3,000 NHMS interviews will be completed. Individual data with linked census track data will be released to the public in 2008, providing a rich resource for research into health-related quality of life in US adults.