| Configural models | Alignment setting | No. of parameters | Log | AIC | BIC |
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1 | Two-factor | Fixed | 615 | −18271.02 | 37772.04 | 42105.44 |
2 | Three-factor | Fixed | 623 | −18901.53 | 39049.06 | 43438.93 |
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Log loglikelihood, AIC Akaike, BIC Bayesian Information Criteria. Note: We tested a three-model based on the tripartite model proposed by Clark and Watson (1991) including the core constellations of anxiety-depressive symptoms and an additional domain of non-specific symptoms (insomnia, fatigue, restlessness, weakness, feeling tense). Models 1 and 2 tested using FREE method (all factor means were freely estimated) were poorly identified and therefore FIXED method (with Putalam fixed as the reference category) was used to estimate the model