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Mismatching of population groups in thoracic surgery case control studies

	author = {Marius Roman and Edward Caruana and Jules Hernandez-Sanchez and Piergiorgio Solli},
	title = {Mismatching of population groups in thoracic surgery case control studies},
	journal = {Journal of Thoracic Disease},
	volume = {7},
	number = {10},
	year = {2015},
	keywords = {},
	abstract = {Thoracic surgery is a rapidly evolving field, in continuous need of high quality clinical evidence. Case control studies are a type of observational study in which two existing groups differing in outcome are identified and compared on the basis of some supposed causal attribute. Case-control studies are often used to identify factors that may/may not contribute to a medical condition by comparing subjects who have that condition/disease (cases) with patients who do not have the condition/disease but are otherwise similar (controls). They require fewer resources but provide less evidence than a randomized controlled trial. As analytical observational studies, control studies are analytical observational studies that represent level II-2 clinical evidence (1).},
	issn = {2077-6624},	url = {}