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

Table 2 Items, measures, and item statistics of the 10-item version of the DLQI

Item No.	Item description	Item measure (Location value^a)	Item fit statistics (Infit MnSq)
1	Itchiness, soreness, pain, or stinging	0.9	1.10
2	Embarrassment/self-consciousness	−0.5	0.94
3	Interferes with shopping/looking after home/garden	−1.2	0.84
4	Influence choice of clothing	0.3	1.03
5	Affects social/leisure activities	−0.5	0.93
6	Affects ability to play sports	−0.5	0.93
7	Prevents working/studying	−1.8	0.79
8	Creates problems with partner/close friends/relatives	0.4	1.05
9^b	Causes sexual difficulties	3.4	1.47
10	Problems with treatment	0.1	1.01

^a The lowest/highest value indicates that the corresponding item is assessing the mildest/most severe impairment
^b This item showed critical misfit according to the Rasch model and had to be removed during the analysis

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