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These severity classifications were then compared based on ED symptoms, general psychopathology, personality, and impulsive behaviours.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>For the DSM\u20105 categories, most ED patients fell into the \u2018mild\u2019 to \u2018moderate\u2019 categories. Using the DT categories, AN patients were mainly represented in the \u2018low\u2019 DT category, and BN, OSFED\/AT, and PD in the \u2018high\u2019 DT category. The clinically significant findings were stronger for the DT than the DSM\u20105 severity approach (medium\u2010to\u2010large effect sizes). AN\u2010BP and AN\u2010R provided the most pronounced effects.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Our findings question the clinical value of the DSM\u20105 severity categorisation, and provide initial support for an alternative DT severity approach for AN.<\/jats:p><\/jats:sec><jats:sec><jats:title>Highlights\u200a<\/jats:title><jats:p><jats:list list-type=\"bullet\">\n<jats:list-item><jats:p>This study assessed an alternative trans\u2010diagnostic drive for thinness (DT) severity.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Category for all eating disorder (ED) sub\u2010types, and then compared this to the Diagnostic and Statistical Manual of Mental Disorders\u20105 (DSM\u20105) severity indices for EDs.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>ED symptoms, general psychopathology, personality, and impulsive behaviours were assessed using both classifications in a total of 2,811 female patients diagnosed with EDs.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Clinically significant findings were stronger for the DT than the DSM\u20105 severity category (medium\u2010to\u2010large effect sizes); there was differentiation of the anorexia nervosa (AN) patients into mainly \u2018low\u2019 DT, and bulimia nervosa (BN) spectrum patients into mainly \u2018high\u2019 DT, vs. most patients were clustered in the \u2018mild\u2010to\u2010moderate\u2019 DSM\u20105 categories.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Our findings provide initial support for an alternative trans\u2010diagnostic DT severity category that may be more clinically meaningful than the DSM\u20105 severity indices for 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