Flawed study

Modern Healthcare - - OPINIONS LETTERS -

Re: “Mass. pa­tients face cost bar­ri­ers to care af­ter re­form: study,” Mod­ern­Health care.com, July 27: The ar­ti­cle re­port­ing the study of ac­cess to care in Mas­sachusetts should point out the ob­vi­ous bias in the sam­ple. If you se­lect only pa­tients vis­it­ing an emer­gency depart­ment, you are much more likely to get those hav­ing trou­ble ac­cess­ing care than if you draw a ran­dom sam­ple. The fact that the sam­pling tech­nique is se­ri­ously flawed makes the re­sults un­re­li­able, a fact that should be noted. Re­searchers use this sort of ap­proach be­cause it is more con­ve­nient than valid sam­pling. Thomas Walsh


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