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The study’s timeline, including the times of measurement and the relevant events surrounding the pandemic.

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Code clusters.

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Summary of the interview scheme and additional measures across all four time points, including example questions.

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Multilevel Modelling of Country Effects: A Cautionary Tale

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The number of symptoms reported by people requesting a SARS-CoV-2 test overall and by SARS-CoV-2 test result, from June 2020 through August 2021, Amsterdam region, the Netherlands.

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Results of the principal components analysis of COVID-19 symptoms.

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Flowchart of exclusions and records included in the analysis, Amsterdam region, the Netherlands, June 2020-August 2021.

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The prevalence of each symptom per month, from June 2020 through August 2021, the Amsterdam region, the Netherlands.

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Odds ratios and 95% confidence intervals per variable in the full multivariable logistic regression model per month, from June 2020 through August 2021, the Amsterdam region, the N...

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The number and percentage of positive SARS-CoV-2 test results by number of symptoms, month, gender, and age group, from June 2020 through August 2021, the Amsterdam region, the Net...