520. What is the purpose of observation units or clinical decision units? / What kinds of conditions are appropriate for observation? October 25th, 2008 by reuben in admin Back Top Tags: card 519. Why perform a multivariate analysis over a univariate analysis? / What is intention to treat? / What is a funnel plot? / Define sensitivity, specificity, negative predictive value (NPV), positive predictive value (PPV), negative likelihood ratio (-LR) and positive likelihood ratio (+LR) 521. Contrast impairment and disability / Specific occupational health questions to ask when managing a possible worker's compensation case / Key differences between worker's comp patient and usual patient, from EM management perspective Leave a Reply Cancel reply Please post any discussion to the emupdates Reddit page.