Observer bias in blood pressure studies.

摘要: Observer variation in blood pressure measurement following training with standard techniques has been investigated a study of 7735 middle-aged men. The initial produced consistent results between observers, but there were progressive deteriorations the ensuing months. Subsequent re-training led to marked though inconsistent reductions variation, within 1 or 2 months, observers reverted back an individual level bias. magnitude observer is line few other published accounts, and sufficient have important implications for group comparisons, clinical trials, care patients. Four methods reducing are considered: regular re-training, self-measurement ambulatory monitoring, automatic sphygmomanometers, adjustment analysis. procedure used British Regional Heart Study described. Regular frequent monitoring performance, use machines presently considered two most practical variation.