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S2 File -

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Steps in the translation procedure of the original COVID-19 Stress Scales (CSS) into the Polish-language.

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Descriptive and cross-language comparison of the original CSS item scores and the CSS-PL_EX in the study 1 with bilingual participants.

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Descriptive, internal consistency reliability, and cross-language comparison of the polish experimental version of the CSS (CSS-PL_EX) and the original CSS scales scores in study 1...

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Factor loadings from 1 factor exploratory structural equation model.

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Factor loadings from 4 factor exploratory structural equation model.

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Factor loadings from 5 factor exploratory structural equation model.

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Factor loadings from 6 factor exploratory structural equation model.

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Reliability of the Polish COVID-Stress Scales (CSS-PL) and correlations among the CSS-PL Scales.

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Results from COVID Stress Scale measurement invariance tests across times 1 and 2.