Hazard ratios of long COVID diagnosis by age group.

Northern Europe indicates Northern Europe other than Denmark. The adjusted model composed age, sex, civil status, education, family income, and CCI. CCI, Charlson comorbidity index; CI, confidence interval; HR, hazard ratio. (DOCX)</p

Pattern of general practitioner contacts before and during COVID-19 pandemic among individuals diagnosed with COVID-19.

Northern Europe indicates Northern Europe other than Denmark. (DOCX)</p

Flowchart of the study population.

Ethnic minorities composed individuals originating outside Denmark (immigrants and their descendants). Native Danes composed individuals originating and/or born in Denmark, including their descendants. Death was defined as all-cause mortality within 6 months after COVID-19 diagnosis.</p

Hazard ratios of long COVID diagnosis by number of doses of COVID-19 vaccine.

Northern Europe indicates Northern Europe other than Denmark. *Estimates are not displayed due to small numbers in accordance with Danish Data Protection Act. The adjusted model composed age, sex, civil status, education, family income, and CCI. CCI, Charlson comorbidity index; CI, confidence interval; HR, hazard ratio. (DOCX)</p

Hazard ratios of long COVID diagnosis among individuals aged 18–60 years and >60 years by region of origin.

Northern Europe indicates Northern Europe other than Denmark. The adjusted model composed age, sex, civil status, education, family income, and CCI. CCI, Charlson comorbidity index; CI, confidence interval; HR, hazard ratio. (DOCX)</p

List of International Classification of Diseases (ICD-10) codes included.

List of International Classification of Diseases (ICD-10) codes included.</p

Hazard ratios of long COVID diagnosis by sex.

Northern Europe indicates Northern Europe other than Denmark. The adjusted model composed age, sex, civil status, education, family income, and CCI. CCI, Charlson comorbidity index; CI, confidence interval; HR, hazard ratio. (DOCX)</p

Hazard ratios of long COVID diagnosis by largest countries of origin.

The adjusted model composed age, sex, civil status, education, family income, and CCI. CCI, Charlson comorbidity index; CI, confidence interval; HR, hazard ratio.</p

Directed acyclic graphs for confounders assessment for the association between migration and long COVID diagnosis.

Green lines indicate the pathway of mediators. Black lines indicate the pathway of confounders. Blue circles indicate mediating factors. White circles indicate confounding factors. Age, sex, civil status, comorbidities, education, and income were identified as confounders. (TIFF)</p