Chronic pain patients can be classified into four groups: Clustering-based discriminant analysis of psychometric data from 4665 patients referred to a multidisciplinary pain centre (a SQRP study).

NbPainReg differed statistically between all groups except between group 3 and 4 (near significance, Table 2 ).

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Overall, we found highly significant p-values for all X-variables and |d|≥0.8 (i.e., a large or very large effect size) in 103 out of 204 computations (i.e., in ≈50% of cells in Table 3 ), thereby confirming the validity of the clustering-based PLS-DA model.

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