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Fig. 2 | Journal of Patient-Reported Outcomes

Fig. 2

From: Psychometric performance of the PROMIS® depression item bank: a comparison of the 28- and 51-item versions using Rasch measurement theory

Fig. 2

Plot of relative items location of the PROMIS 51 and 28 item pools. The blue dots represent the item locations for each item within the PROMIS 28 and PROMIS 51 (as anchored on the PROMIS-28 measurement continuum) item banks. The items located on the left of the continuum are the easiest (i.e. are relevant to persons with lower levels of depression); items towards the right are the most difficult (i.e. are relevant to person with higher levels of depression). The PROMIS 51 items cover parts of the continuum (<− 0.75) and around (− 0.50 to 0.00) where the PROMIS 28 item distribution displays item gaps, as well as smaller gaps of the 28-item pool along the continuum

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