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Fig. 2 | Health and Quality of Life Outcomes

Fig. 2

From: Rasch analysis holds no brief for the use of the Dermatology Life Quality Index (DLQI) in Chinese neurodermatitis patients

Fig. 2

Rasch model category probability curves for all DLQI items together, showing the likelihood that a participant with a particular subjective severity level will select a category. The x-axis represents the latent trait of HRQoL, and the y-axis represents the probability of response category being selected. Curve a for item 2,3,5,6,7, and curve b for item 1,4,8,10 and curve c for item 9 are shown respectively. For any given point along this scale, the category most likely to be chosen by a participant is shown by the category curve with the highest probability. Red: not at all/not relevant; blue:a little; pink: a lot; black:very much

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