The SF-36 is a practical and valid instrument for use in postal surveys of older people living at home. The population scores provided here may facilitate its use in future surveys of older adults.

WOMAC is the instrument of choice for evaluating the outcome of knee replacement surgery in OA. The SF-36 provides a more general insight into patients' health and may be more responsive to change than the WOMAC in a heterogeneous rheumatology clinic population. Researchers wishing to undertake an economic evaluation might consider the EQ-5D for a surgical, but not a rheumatology clinic group.

Objectives-To assess the impact of myocardial infarction on quality of life in four year survivors compared to data from "community norms", and to determine factors associated with a poor quality of life. Design-Cohort study based on the Nottingham heart attack register. Setting-Two district general hospitals serving a defined urban/rural population. Subjects-All patients admitted with acute myocardial infarction during 1992 and alive at a median of four years. Main outcome measures-Short form 36 (SF 36) domain and overall scores.Results-Of 900 patients with an acute myocardial infarction in 1992, there were 476 patients alive and capable of responding to a questionnaire in 1997. The response rate was 424 (89.1%). Compared to age and sex adjusted normative data, patients aged under 65 years exhibited impairment in all eight domains, the largest diVerences being in physical functioning (mean diVerence 20 points), role physical (mean diVerence 23 points), and general health (mean diVerence 19 points). In patients over 65 years mean domain scores were similar to community norms. Multiple regression analysis revealed that impaired quality of life was closely associated with inability to return to work through ill health, a need for coronary revascularisation, the use of anxiolytics, hypnotics or inhalers, the need for two or more angina drugs, a frequency of chest pain one or more times per week, and a Rose dyspnoea score of > 2. Conclusions-The SF 36 provides valuable additional information for the practising clinician. Compared to community norms the greatest impact on quality of life is seen in patients of working age. Impaired quality of life was reported by patients unfit for work, those with angina and dyspnoea, patients with coexistent lung disease, and those with anxiety and sleep disturbances. Improving quality of life after myocardial infarction remains a challenge for physicians. (Heart 1999;81:352-358)