Fig. 1From: Rasch analysis holds no brief for the use of the Dermatology Life Quality Index (DLQI) in Chinese neurodermatitis patientsItem characteristic curve and item information curve for item 9. The curves represent the item as high difficulty − low discrimination because it is more likely to be endorsed at high levels of severity. However, it is relatively imprecise in measuring individual differences among respondents. X-axis - the latent trait of HRQoL. Y-axis - the probability of participant response. a Item Character Curve, b Item Information CurveBack to article page