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Table 4 TAS-8 graded response model parameters and equivalent factor loadings for full sample

From: RETRACTED ARTICLE: Improving the measurement of alexithymia in autistic adults: a psychometric investigation and refinement of the twenty-item Toronto Alexithymia Scale

TAS-20 Item # Item Content a1 d1 d2 d3 d4 λ h2
1 I am often confused about what emotion I am feeling 2.802 3.092 − 0.689 − 2.740 − 6.336 0.855 0.731
2 It is difficult for me to find the right words for my feelings 2.190 3.478 0.491 − 0.931 − 3.841 0.790 0.623
6 When I am upset, I don’t know if I am sad, frightened, or angry 2.335 2.090 − 0.805 − 2.413 − 5.497 0.808 0.653
9 I have feelings that I can’t quite identify 2.402 3.137 0.072 − 1.434 − 5.170 0.816 0.666
11 I find it hard to describe how I feel about people 1.870 2.745 − 0.234 − 1.505 − 4.340 0.740 0.547
12 People tell me to describe my feelings more 1.235 1.739 − 0.526 − 1.636 − 3.644 0.587 0.345
13 I don’t know what’s going on inside me 1.892 2.054 − 0.646 − 2.231 − 4.771 0.743 0.553
14 I often don’t know why I am angry 1.538 1.285 − 1.133 − 2.201 − 4.361 0.671 0.450
  1. Parameters estimated using maximum marginal likelihood based on Bock–Aitkin EM algorithm. This model contained two groups: general population (θ fixed to M = 0, SD = 1 in this group) and autistic group (mean and SD of θ free to vary), with all item parameters constrained to equality between groups
  2. TAS Toronto Alexithymia Scale, a1 slope parameter, d1d4 item intercept parameters (more positive values indicate “easier” items), λ factor loading on single factor, h2 = communality (squared factor loading)