Studying only admissions is a source of potential bias

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Abstract
EDITOR,--U M Guly and colleagues state that their study, which claims to show that “paramedics and technicians are equally successful at managing cardiac arrest outside hospital,” does not “diminish the role of paramedics.”1 Yet the paragraph about their paper in This week in BMJ concludes that such patients “are best treated” by technicians and calls into question the requirement of having a paramedic in …