In other words , health care interventions overall are based not on what has been scientifically demonstrated to be helpful , but are more often based on the practitioner 's experiences or perceived knowledge (the provider was taught to do it "folk lore " rational thought , etc (Crosby , 1999 , p . 35-38 . Years of research into factors influencing health have identified a number of societal , physical , psychological , environmental , and organizational factors . Therefore , when one attempts to evaluate patient care outcomes , a multitude of factors...











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