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The NHEFS sets a very high standard for health status measurement in SRH - mortality studies, because it combines standardized MD-administered physical examinations and standard laboratory screening tests for cholesterol, potassium, albumin, hematocrit, blood pressure, and measured height and weight (objective, external indicators of health/disease) with very detailed interviews on medical history, dietary practices and health risk behaviors (self-reports). The primary purpose of the original NHANES was to detect undiagnosed disease in the population, particularly cardiovascular or nutrition-related disease. Self-ratings of health (SRH) were collected as part of the medical history interview -- it was the opening question.