Objectives Cardiopulmonary involvement (CPI) is a major cause of morbidity and mortality in systemic sclerosis (SSc). The 6 min walk test (6MWT) is widely used to assess functional capacity, but its ...

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Model 1 (base model): follows the conceptual model highlighted above in Equation ... 6.4 to 6.5) (table 2). However, the kink term was itself omitted in Model 3 due to collinearity, meaning it could ...