Fig. 1From: Psychometric evaluation of a patient-reported outcomes instrument for congenital thrombotic thrombocytopenic purpuraComposition of the cTTP-PEQ multi-item and single-item domains Domains are based on a conceptual model because the small sample size did not allow for domains to be constructed using factor analysiscTTP-PEQ Congenital Thrombotic Thrombocytopenic Purpura–Patient Experience QuestionnaireBack to article page