Thyroid disease

Association of COVID-19 Infection with Subsequent Thyroid Dysfunction: An International Population-Based Propensity Score Matched Analysis

ThyroidPublished Retrospective cohort study

Main finding · Thyroid dysfunctionResult — go to the resultHazard ratio 2.07 95% CI 2.01–2.12

Authors' conclusion

COVID-19 infection was associated with an increased risk of thyroid dysfunction, including thyrotoxicosis and hypothyroidism, regardless of age or sex, during a 12-month follow-up period.

Study context

Population
Patients in the TriNetX international electronic health records database; matched for age, sex, race and comorbiditiesbefore matching
Participants
1,379,311 vs 6,896,814
Exposure
COVID-19 vs no COVID-19
  • COVID-19n = 1,379,311
  • Non-COVID-19n = 6,896,814reference
Outcome
Diagnosis of thyroid dysfunction (thyrotoxicosis or hypothyroidism), analysed by hazard ratios (HRs) and Kaplan-Meier curves, stratified by age and sex
Follow-up
Within 12 months
Methodological detailspropensity score matched, international, population-based
  • Propensity score matched
  • International
  • Population-based

Main finding

Thyroid dysfunction · 3 months postexposure

Hazard ratio

2.07

95% CI 2.01–2.12

COVID-19vs Non-COVID-19
HR 2.07 (95% CI 2.01–2.12)

As reported in the abstract

Increased risk persisted up to 12 months: overall thyroid dysfunction, fold increased risk
∼2.01

Observational data: associations, not effects.

Further findings

OutcomeEstimate
Thyrotoxicosis and hypothyroidism (short term) · 3 months postexposureCOVID-19vs Non-COVID-19HR (thyrotoxicosis) 2.10 (CI 1.92–2.29)
Thyrotoxicosis and hypothyroidism (short term) · 3 months postexposureCOVID-19vs Non-COVID-19HR (hypothyroidism) 2.08 (CI 2.01–2.13)

Thyroid dysfunction by age subgroup

Age ≥65 years: HR
2.18 (CI 2.11-2.25)
Age <65 years: HR
1.97 (CI 1.91-2.03)
  • Subgroup analysis

Thyroid dysfunction by sex subgroup

Females: HR
2.12 (CI 2.06-2.16)
Males: HR
1.76 (CI 1.69-1.82)
  • Subgroup analysis

Thyrotoxicosis and hypothyroidism (long term) · up to 12 months

Increased risk for thyrotoxicosis
1.8-fold
Increased risk for hypothyroidism
2.04-fold

Original publication

Association of COVID-19 Infection with Subsequent Thyroid Dysfunction: An International Population-Based Propensity Score Matched Analysis. Thyroid. Published 20 March 2024. doi:10.1089/thy.2023.0626

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