COVID-19 Trends and Impact Survey (CTIS), Global, 2020-2022 (ICPSR 39206)
Version Date: Jun 3, 2025 View help for published
Principal Investigator(s): View help for Principal Investigator(s)
Frauke Kreuter, University of Maryland, LMU Múnich;
Kathleen Stewart, University of Maryland
https://doi.org/10.3886/ICPSR39206.v3
Version V3 (see more versions)
Summary View help for Summary
The COVID-19 Trends and Impact Survey (CTIS) was conducted by the Delphi Group at Carnegie Mellon University (CMU) in the United States (US) and by the University of Maryland (UMD) Social Data Science Center (SoDa) globally, in partnership with Meta. CTIS was a daily repeated cross-sectional survey that ran continuously starting April 6, 2020 in the US and starting April 23, 2020 globally. Both surveys concluded data collection on June 25, 2022. CTIS collected data in 200+ countries and territories, including 114 where Meta provided survey weights. The sampling frame was Facebook users aged 18 years or older who have been active on the platform in the last month. Sampled Facebook users saw the invitation at the top of their Feed, but the surveys were collected by the universities using Qualtrics. Meta neither collected nor received survey responses. The sample was stratified by subnational regions. Respondents were sampled as frequently as every month and as infrequently as every six months, depending on the population density of the subnational region in which they lived. Due to the minimum sampling frequency, pooled analyses should not combine more than a month of data. There were 12 versions of the survey questionnaires. The Delphi US CTIS was translated into 8 languages. The UMD Global CTIS was translated into 66 languages.
This collection is comprised of three categories of data:
a. Individual-level microdata files, which will be available to eligible academic and nonprofit researchers with fully executed Data Use Agreements (DUAs).
b. Daily aggregate estimates at the country and subnational region levels disseminated via public APIs at CMU and UMD.
c. Weekly and monthly aggregate estimates broken out by respondent characteristics (e.g., age, gender, vaccination status) at the country and subnational administrative level-1 region-level disseminated via publicly available CSV-formatted contingency tables.
This collection currently only contains the aggregate data, contingency tables and associated documentation. The microdata are forthcoming.
Citation View help for Citation
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Funding View help for Funding
Subject Terms View help for Subject Terms
Geographic Coverage View help for Geographic Coverage
Smallest Geographic Unit View help for Smallest Geographic Unit
Country
Restrictions View help for Restrictions
This data collection may not be used for any purpose other than statistical reporting and analysis. Use of these data to learn the identity of any person or establishment is prohibited. To protect respondent privacy, some of the data files in this collection are restricted from general dissemination. To obtain these restricted files researchers must agree to the terms and conditions of a Restricted Data Use Agreement.
Distributor(s) View help for Distributor(s)
Time Period(s) View help for Time Period(s)
Date of Collection View help for Date of Collection
Data Collection Notes View help for Data Collection Notes
- Please visit the CTIS Global website for additional information.
Study Purpose View help for Study Purpose
The aim of this study was to support research and inform public health decisions relating to the COVID-19 pandemic.
Study Design View help for Study Design
CTIS was a daily repeated cross-sectional survey that ran continuously starting April 23, 2020 globally. Data collection concluded on June 25, 2022. CTIS collected data in 200+ countries and territories (everywhere except Cuba (CU), China (CN), Iran (IR), North Korea (NP), Syria (SY), and Turkmenistan (TM)), including 114 where Meta provided survey weights. The sampling frame was Facebook users aged 18 years or older who had been active on the platform in the last month. Sampled Facebook users saw the invitation at the top of their Feed, but the surveys were collected by the universities using Qualtrics. Meta neither collected nor received survey responses. There were 12 versions of the survey questionnaires. The UMD Global CTIS was translated into 66 languages.
Sample View help for Sample
The sample was stratified by subnational regions. Respondents were sampled as frequently as every month and as infrequently as every six months, depending on the population density of the subnational region in which they lived. Due to the minimum sampling frequency, pooled analyses should not combine more than a month of data.
Universe View help for Universe
Adult residents of the sampled countries who are active Facebook users.
Data Type(s) View help for Data Type(s)
HideOriginal Release Date View help for Original Release Date
2025-02-25
Version History View help for Version History
2025-06-03 Added microdata files in compressed zip packages.
2025-04-23 Contingency Tables documentation and data has been added.
Weight View help for Weight
Please see the User Guide for the COVID-19 Trends and Impact Survey Weights for details on use of the weights.
HideNotes
These data are freely available to data users at ICPSR member institutions. The curation and dissemination of this study are provided by the institutional members of ICPSR. How do I access ICPSR data if I am not at a member institution?
One or more files in this data collection have special restrictions. Restricted data files are not available for direct download from the website; click on the Restricted Data button to learn more.