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Table 4 Short form item properties (n = 13) in order of item difficulty

From: Validation of the short assessment of health literacy (SAHL-D) and short-form development: Rasch analysis

Item Measure Model Infit Outfit
SE MNSQ ZSTD MNSQ ZSTD
Ventricle 2.47 0.07 0.95 −1.5 0.84 −1.8
Reflux 1.32 0.07 0.88 −4.6 0.86 −2.7
Gelling agent 1.29 0.07 1.11 3.8 1.17 3.1
Pessary 0.73 0.07 0.95 −1.8 0.88 −2.4
Malaise 0.5 0.07 1.13 4.2 1.24 4.2
Orthodontia 0.44 0.07 1.09 2.7 1.18 3.2
Chlamydia 0.25 0.07 0.93 −2 0.89 −1.9
Echography 0.04 0.07 1.04 1.1 1.01 0.1
Chiropractor −0.44 0.08 1.1 2.3 1.29 3.3
Biopsy −1.36 0.1 0.91 −1.4 0.78 −1.7
Plaque −1.74 0.11 0.81 −2.7 0.7 −2
Obesity −1.75 0.11 0.94 −0.7 0.9 −0.6
Flaking −1.77 0.11 1.01 0.2 1.3 1.7