{"code":"C28186","name":"Selection Bias","terminology":"ncit","version":"26.09d","conceptStatus":"DEFAULT","leaf":true,"active":true,"synonyms":[{"name":"Selection Bias","termType":"PT","type":"FULL_SYN","typeCode":"P90","source":"FDA-NIH-MoRE"},{"name":"selection bias","termType":"PT","type":"FULL_SYN","typeCode":"P90","source":"NCI-GLOSS","code":"CDR0000044087"},{"name":"Selection Bias","termType":"PT","type":"FULL_SYN","typeCode":"P90","source":"NCI"},{"name":"Selection Bias","type":"Preferred_Name","typeCode":"P108"}],"definitions":[{"definition":"An error in choosing the individuals or groups to take part in a study.  Ideally, the subjects in a study should be very similar to one another and to the larger population from which they are drawn (for example, all individuals with the same disease or condition).  If there are important differences, the results of the study may not be valid.","code":"P325","type":"ALT_DEFINITION","source":"NCI-GLOSS"},{"definition":"Bias encountered due to enrolling study participants that do not reflect the intended target population.","code":"P97","type":"DEFINITION","source":"NCI"},{"definition":"Systematic error in estimation of an association or other parameter that results from factors that influence study participation or eligibility for analyses.","code":"P325","type":"ALT_DEFINITION","source":"FDA-NIH-MoRE"}],"properties":[{"code":"P322","type":"Contributing_Source","value":"FDA-NIH-MoRE"},{"code":"P366","type":"Legacy Concept Name","value":"Selection_Bias"},{"code":"P106","type":"Semantic_Type","value":"Idea or Concept"},{"code":"P207","type":"UMLS_CUI","value":"C0036577"}]}