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Additional file 1: Table S1. The PSS-14 items divided into Perceived Stress and Perceived Control subscales. Table S2. Item fit statistics for the PSS-14. Table S3. Item fit statistics for the Perceived Stress subscale. Table S4. Local dependence of the revised PSS-14 items. Table S5. Kelderman’s likelihood ratio tests for the GLLRM of Perceived Stress subscale. Table S6. Item fit statistics for the Perceived Control subscale. Table S7. Item fit statistics for the GLLRM of the Perceived Control subscale. Table S8. Kelderman’s likelihood ratio tests for the GLLRM of the Perceived Control subscale. Table S9. Conversion table for score adjustment. Table S10. Convergent and divergent validity of the PSS-14.

Additional file 1. Contains a figure with the subscale structure of the PSS in previous validity studies and four tables with item fit statistics.

Additional file 3. Contains consistency tables with inter-item correlations and item-restscore correlations for each subscale in each subsample.

Figure S2. Test information function: Meaninglessness stratified by age group. (DOCX 31Â kb)

Figure S3. Test information function: Social isolation stratified by sex and age group. (DOCX 51Â kb)