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The purpose of this study was to review and update the content of the Canadian Hemophilia Outcomes–Kids’ Life Assessment Tool version 2.0 (CHO‐KLAT), in the context of extended half‐life (EHL) factor concentrates (FCs) and to establish the validity and reliability of the updated CHO‐KLAT.    Methods  Focus groups were conducted with boys with hemophilia, their parents, and health care providers across Canada to review the CHO‐KLAT v2.0 and determine if any modifications were required. The validity of the revised CHO‐KLAT (version 3.0) was then determined in a sample of boys with hemophilia and their parents by calculating its correlation with the Pediatric Quality of Life Core Module (PedsQL‐Core). Test‐retest reliability was assessed using an intraclass correlation coefficient (ICC).    Results  Thirteen focus groups at 5 pediatric hemophilia treatment centers (HTCs) (n = 71) resulted in 19 changes to the CHO‐KLAT v2.0, generating a revised 40‐item CHO‐KLAT, the CHO‐KLAT v3.0. Thirty‐five boys with hemophilia (median age, 14; range, 7–17 years) and 47 parents participated in the validation of the CHO‐KLAT v3.0. There was a moderate correlation between the CHO‐KLAT v3.0 child self‐report and PedsQL‐Core ( r  = 0.56,  P  = .01), and a strong correlation between the CHO‐KLAT v3.0 parent‐proxy and PedsQL‐Core ( r  = .79,  P  = .0007). The test‐retest reliability ICC was 0.90 for the child self‐report CHO‐KLAT v3.0 and 0.68 for the parent‐proxy CHO‐KLAT v3.0.    Conclusion  The CHO‐KLAT v3.0 is a reliable and valid child‐centric tool that effectively measures health‐related quality of life in boys with hemophilia who are receiving standard half‐life or EHL FCs.

Updating the Canadian Hemophilia Outcomes–Kids’ Life Assessment Tool (CHO‐KLAT) in the era of extended half‐life clotting factor concentrates