Item correlations
cognitive symptoms, tiredness, fatigue
Most NASH-CHECK items showed at least moderate correlations (≥ 0.3) with other items hypothesized to assess the same underlying measurement concept. Overall, the strongest correlations suggesting potential redundancy (i.e., ≥ 0.8) were generally among subsets of items assessing tiredness and fatigue, cognitive symptoms, daily activity limitations, ambulation, and relationship and social issues. In contrast, the item assessing food restriction had consistently lower correlations with other items.