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Table 4 Model fit of confirmatory factor analysis in separate and combined groups (confirmatory sample)

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 Model N Χ2 df Χ2/df ratio p RMSEA CFI TLI
Autistic 0 155 35.92 5 7.18 .001 .2 .915 .829
Autistic 1 155 6.4 4 1.6 .171 .062 .993 .983
Possibly autistic 0 113 22.59 5 4.52 .001 .177 .924 .847
Possibly autistic 1 113 2.88 4 .721 .578 .001 1 1.01
Combined autistic/possibly autistic 0 268 52.46 5 10.49 .001 .189 .925 .85
Combined autistic/possibly autistic 1 268 4.36 4 1.09 .359 .018 .999 .999
Non-autistic 0 136 32.34 5 6.47 .001 .201 .927 .853
Non-autistic 1 136 18.32 4 4.58 .001 .163 962 .904
Non-autistic 2 136 2.87 3 .96 .412 .001 1 1.001
  1. Recommended goodness of fit indices values demonstrating good model fit: χ2/df ratio close to zero (Bryant & Yarnold, 1995), RMSEA < 0.06, CFI > 0.95 and TLI > 0.9 (Browne, 2014; Hu & Bentler, 1993). Model 0 indicates baseline models without covaried error terms. Model 1 covaried error terms for items 1 + 5; Model 2 covaried error terms for items 3 + 4, and items 3 + 5 (Fig. 2)