The CCCSL—our dataset on government interventions to curb COVID-19—is now published
To know which non-pharmaceutical interventions against the spread of coronavirus worked best, researchers and health authorities need data. In March, the Hub therefore started a comprehensive worldwide collection of governmental measures. We named it CSH COVID-19 Control Strategies List, in short:CCCSL.
To date, the CCCSL includes information on 6,068 interventions from 56 countries: 33 European, 12 Asian, five South American, two North American, three African, and one Oceanian countries, plus the cruise ship Diamond Princess. For the U.S., we have data for 24 single U.S. states.
The CCCSL is published today in the Nature journal Scientific Data—we are proud to say: side by side with the database of Johns Hopkins University.
When did governments implement their measures against the spread of coronavirus infections?
The heatmap shows the country-based timelines of interventions against the COVID-19 pandemic. Using the epidemic age instead of calendar days allows to compare the differences in governmental approaches. The day of reference, called “time zero,” is the day when the number of reported cases in the specific country equals (or is higher than) 10. The color scheme follows the traffic light logic: The “greener” a square, the earlier the measure was taken. Later measures are colored yellow, orange or red.
Highly detailed data for in-depth analyses
“The special value of our dataset is its granularity,” says project leader and first author Amélie Desvars-Larrive (CSH & Univ of Veterinary Medicine Vienna). “To our knowledge, it is to date the most detailed classification of government measures against COVID-19.”
On the most general level (L1), we divided the measures in seven groups: case identification; contact tracing and related measures; environmental measures, such as disinfection and cleaning of common surfaces (public transports, markets); healthcare and public health capacity (e.g. increase of the hospital capacity or of the healthcare workforce); resource allocation (i.e. operations involved in the allocation of budgets, deployment of resources, and distribution of goods for controlling a disease outbreak); risk communication; social distancing; travel restriction; and, a newer category, returning to normal life.
Each intervention is coded into four levels, from a broad categorisation of the measures (L1) to a very specific description (L4). “As an example, we have seven categories of travel restrictions, which are further divided into more than 50 subcategories,” says Amélie. Moreover, the use of self-explanatory codes makes the dataset readily comprehensible, even for non-experts. The coding scheme of the dataset exhibits a great analytical flexibility and makes it especially valuable for computer-aided techniques like Machine Learning.
Johannes also produced a short walk-through video that explains his visualization:
Dealing with a pandemic
“With the CCCSL, we hope to contribute to a better management of the corona crisis or similar epidemics in the future,” says David Garcia (CSH & Medical Univ of Vienna). David is one of the co-authors. “With comprehensive data, scientists and politicians will be able to better assess individual risks, to develop tailor-made containment strategies or approaches how to end strict measures, for instance,” David says.
For example, our scientists were combining the CCCSL data with publicly available data on COVID-19 cases. “We quantified the impact of individual control policies and came up with a ranking according to their effectiveness in reducing coronavirus spread,” says Amélie. These findings—we lately reported on them—are currently under review.
The CCCSL data were collected from public sources, including official government sources, scientific papers, press releases, government communications and social media. All records were hand-coded and are updated on a regular basis.
During the COVID-19 crisis, other research teams have concomitantly tracked data on government policies. Joining forces to fight the pandemic, the CCCSL and six other international datasets have been integrated into the global dataset Tracking Public Health and Social Measures (PHSM) aggregated by the World Health Organization.
Amélie Desvars-Larrive et al., A structured open dataset of government interventions in response to COVID-19, Scientific Data Vol 7 Article number: 285 (2020)
USING THE CCCSL:
Nils Haug et al., Ranking the effectiveness of worldwide COVID-19 government interventions (in review).
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