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Fig. 8 | BMC Psychiatry

Fig. 8

From: Validation and psychometric properties of the Somatic and Psychological HEalth REport (SPHERE) in a young Australian-based population sample using non-parametric item response theory

Fig. 8

Difficulty and discrimination of the 11 items suitable for the somatic distress scale. The first principal component corresponds to the difficulty of the items, the easiest items being on the left (items 22 and 32). The second principal component measures the items’ discrimination (item 29 being the most discriminant, 1 the least discriminant). Added items appear in red

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BMC Psychiatry

ISSN: 1471-244X

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