TAS-20 Item #
|
χ2(5)
|
pFDR
|
wABC
|
ESSD
|
Parametersa
|
---|
1
|
35.30
|
< 0.001
|
0.089
|
− 0.018
|
a1, d1, d2
|
2
|
23.18
|
< 0.001
|
0.164
|
0.157
|
d2, d3
|
3
|
65.10
|
< 0.001
|
0.433b
|
0.670b
|
d2, d3, d4
|
9
|
26.03
|
< 0.001
|
0.064
|
− 0.021
|
d1
|
11
|
30.47
|
< 0.001
|
0.165
|
0.001
|
a1, d2, d3
|
12
|
30.19
|
< 0.001
|
0.149
|
− 0.187
|
d1
|
13
|
57.66
|
< 0.001
|
0.064
|
− 0.022
|
a1, d1, d2, d3, d4
|
14
|
61.90
|
< 0.001
|
0.031
|
− 0.022
|
a1, d1, d2, d3, d4
|
- Results indicate omnibus Wald tests of differential item functioning using the iterative anchor-selection method of Cao et al. [137]. P values (pFDR) are corrected for a 5% false discovery rate using the Benjamini–Hochberg procedure. Parameters that were significantly different between groups when tested alone with follow-up Wald tests (pFDR < 0.05) are indicated in the Parameters column
- wABC weighted area between curves, ESSD expected score standardized difference (in Cohen’s d metric), a1 slope parameter, d1–d4 item intercept parameters (i.e., item “difficulty” parameters)
- aParameters in bold are larger (i.e., more discriminating for a parameters and “easier” for d parameters) in the autistic group. Larger values of a indicate that the item is more strongly related to the latent trait in autistic adults, whereas larger values of d indicate that a given item response is endorsed at lower latent trait levels in autistic adults relative to the general population
- bPractically significant DIF (i.e., wABC > 0.3)