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Table 3 DIF for educational groups (N = 1217)

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

Item Educational groupa DIF contrastb Prob (Welch t)c
Apnea 1 vs 3 −1.01 .0003
Psoriasis 1 vs 3 −.70 .0005
Adrenalin 1 vs 3 −.67 .8777
Malaise 1 vs 3 −.63 .0005
Delirium 1 vs 3 −.53 .0128
Chlamydia 1 vs 3 −.50 .0059
Psoriasis 2 vs 3 −.72 .0001
Chlamydia 2 vs 3 −.60 .0002
Delirium 1 vs 2 −.70 .0007
Apnea 1 vs 2 −.62 .0260
Palliation 3 vs 2 −.74 .0000
Prenatal 3 vs 2 −.76 .0000
Euphoria 2 vs 1 −.75 .0014
Pancreas 2 vs 1 −.59 .0015
Euphoria 3 vs 1 −1.17 .0000
Pancreas 3 vs 1 −.91 .0000
Prenatal 3 vs 1 −.96 .0000
Palliation 3 vs 1 −.53 .0044
  1. aNote. Education group 1 = low; 2 = middle; 3 = high
  2. bNote. The DIFcontrast measure illustrates the difference between the item measures or the difference of the item between two groups. A difference of at least 0.50 logits is required for DIF to be noticeable. A negative DIF contrast means that the item was easier for the group on the left, whereas a positive DIF contrast means that the item was more difficult for the group on the left
  3. cNote. The Prob illustrates the probability of observing this amount of contrast by chance. Only items that are statistically significant at the p < 0.05 level are displayed