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Table 1 EQ-5D data format to calculate Improved RIDIT

From: Improved RIDIT statistic approach provides more intuitive and informative interpretation of EQ-5D data

Level of severity (l) 1 2 k Total
Sample Y \( {f}_Y^{(1)} \) \( {f}_Y^{\left(k-1\right)} \) \( {f}_Y^{(k)} \) ny
Sample X \( {f}_X^{(1)} \) \( {f}_X^{\left(k-1\right)} \) \( {f}_X^{(k)} \) nx
Total t1 tk − 1 tk N = ny + nx
  1. k is the number of the dimension levels, i.e., k = 3 and k = 5 for EQ-5D-3 L and EQ-5D-5 L, respectively. Levels L1, …, Lk are ordered from least to most severe. For each level \( l=1,\dots, k,{f}_Y^{(l)}\;\mathrm{and}\;{f}_X^{(l)} \) denote the observed frequencies of the Y and X samples, respectively