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Table 5 Results of tests for measurement invariance in SBQ-ASC across the diagnosed autistic and possibly autistic adult groups

From: Development and validation of the suicidal behaviours questionnaire - autism spectrum conditions in a community sample of autistic, possibly autistic and non-autistic adults

Model Χ2 df Model fit CFI TLI ΔM Model difference P
RMSEA Δdf Δχ2
M1: configural invariance (unconstrained) 7.56 8 .001 1 1.001     .478
M2: metric invariance 10.53 11 .001 1 1.001 M2–M1 3 2.97 .396
1M3: scalar invariance 11.67 12 .001 1 1.001 M3–M2 1 1.14 .286
M4: residual invariance 26.07 16 .039 .988 .985 M4–M3 4 14.41 .006
  1. RMSEA = Root-mean-square error of approximation. CFI = comparative fit index. TLI = Tucker-Lewis Index
  2. 1Marginally significant degradation in fit is seen after this model (increase in RMSEA > .015 and reduction in CFI > .01)