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NBME 20 Answers

nbme20/Block 4/Question#27 (35.5 difficulty score)
An investigator is studying patients with ...
Case series🔍,📺
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 +5 
submitted by sympathetikey(1440),
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aeCs ieSres

A uorgp ro esisre of case septrro gnliovnvi steaptin ohw eerw nigev srilima at.tentmer otsrpRe fo eacs irsese yaululs aontcin eetdldai romfnaioint btoua het dniidvlaiu itanpest. siTh cilnsude igporamecdh mioraftnnio (ofr lpee,xma ,gae ern,dge ecitnh ii)rogn nad naontiofrim no o,iiangsds aetntm,ter seernops to tamt,eernt and wulopolf- etafr t.emaetnrt

In tsih etuon,isq ti loosk keli ehyt tnid'd erlayl osufc no het ttaetemnr rtap fo ti tub oisetwe,rh sekma nsees

sympathetikey  Source: https://www.cancer.gov/publications/dictionaries/cancer-terms/def/case-series +2  
ngman  I think another factor is that in case series studies there is no control group vs case-control, cohort...ect +20  
leaf_house  "There is often confusion in designating studies as 'cohort studies' when only one group of subjects is examined. Yet, unless a second comparative group serving as a control is present, these studies are defined as case-series." https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2998589/ +  
fataldose  explanation of one of the wrong options - correlational study A correlational study is a type of research design where a researcher seeks to understand what kind of relationships naturally occurring variables have with one another. In simple terms, correlational research seeks to figure out if two or more variables are related and, if so, in what way. (source - https://study.com/academy/lesson/what-is-a-correlational-study-definition-examples.html ) +1  
j44n  you dont need a control group in a cross sectional one so how do you differentiate that +  
imatinib2412  The key to eliminate cross-sectional study here is the "During a 5-year period" part; cross-sectional studies you basically "take a picture" of a certain population and evaluate prevalence of disease/risk factors at that point in time +  



 +2 
submitted by bibobra(2),
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A saec iserse is iylmsp a notcliocel of aecs esuis,dt yatlpcliy aoiecvr,ntesv atht nuomctde a rmilsai eapntti paertoteinsn ro saedsie imtisntanaefo.




 +1 
submitted by aoa05(30),

Case series is the correct answer. This is because there is no relationship being studied here. There is one outcome of interest with is West Nile virus infection. By definition, case series study is descriptive only (no comparison group). It includes group of patients with certain disease or with abnormal sign and symptom.