The countries whose data are presented were selected according to the following criteria:

a) Countries with advanced stage of the epidemic (China, South Korea, Iran, Italy)

b) Countries with a population of a similar size to that of Greece (Portugal, Switzerland, Austria, Sweden, Belgium)

c) Countries with different approaches to dealing with the epidemic (Netherlands, Sweden, Great Britain)

d) Areas of high interest with significant development of the epidemic (USA, France, Germany, Spain, Great Britain)

The parameters presented and evaluated in the context of the pandemic monitoring effort are as follows:

[POP]: The population of each country

[CASES]: The total number of confirmed cases of SARS CoV-2 virus to date. The number is updated after the announcement of the total daily number from each country.

[CASES / MIL]: The confirmed cases per 1 million inhabitants of each country. It is noted that this parameter is partly an indication of the spread of the epidemic in each country, as it is significantly affected by the number of samples examined based on either the country's strategic selection or its capabilities.

[DEATHS]: The total number of deaths attributed to the SARS CoV-2 virus to date. The number is updated after the announcement of the total daily number from each country.

[DEATHS / MIL]: The total number of deaths per 1 million inhabitants of each country. It is the most representative parameter of the spread and severity of the epidemic in each country, compared to the corresponding number of cases per million inhabitants, as it excludes the factor of the tests conducted by each country.

[DEATHS/CASES]: Percentage of deaths in confirmed cases. This parameter must be evaluated taking into account the number of samples examined based on either the country's strategic selection or its capabilities. A small number of samples examined leadS to an underestimation of the number of cases and an increase in the death rate from confirmed cases. Globally, the percentage seems to be around 4.5%, with significant differences per country.

[RECOV.]: The total number of people who have recovered from SARS CoV-2 infection by the day of the update. It is noted that the number is updated after the announcement of the total dailyt number from each country.

[RECOV. / DEATHS]: The ratio of the number of people who have recovered to the number of deaths. This parameter is interesting as it does not take into account the number of confirmed cases and therefore can be used more safely for comparative assessments as it does not include the factor of the number of tests performed by each country. China and South Korea showed values of 4.69 and 0.69 respectively at the peak and are currently at values above 22 and 29 respectively. In advanced stages of the spread, the parameter is indicative of the effectiveness, and indirectly of the degree of overload of the healthcare system of each country.

[CRIT PAT]: The number of patients in critical condition. The number is updated after the announcement from each country. It usually refers to patients intubated in ICUs. This number is particularly critical of the state of healthcare in each country, depending on the number of available ICU beds available.

[HC PRES.]: The degree of pressure on the healthcare system of each country. Values above 100% are indicative of overload of the health system, as it usually means that intubated patients are being treated outside the ICUs. The parameter is calculated taking into account the numbers of available ICU beds for each country (a 40% increase in available beds due to state emergency measures is considered), the average occupation rate for patients besides SARS CoV-2 cases and the number of critically ill patients due to SARS CoV-2 virus infection. This indicator is a simplified approach as it does not take into account critical parameters, such as the overload of incidents in specific geographical areas, the number of available respirators and the strength of nursing and medical staff. It is an initial indication of the state of the country's healthcare system and a critical factor in the further development of the epidemic.

[1st CASE DATE]: The date on which the first confirmed case was recorded in that country. It is noted that in several countries there was a record of the first case quite early (pe in Italy on 31/1/20, in France on 25/1/20) and a significant period of time elapsed until the appearance of the next cases that marked the beginning of the broad dispersion.

[MASS CASES DATE]: The date of the mass occurrence of cases, which is often different from the occurrence of the 1st case, according to the above.

[CASES RATE 5d AVG]: A 5 days average of the increase rate of total number cases. The values ​​of this parameter are increased at the beginning of the spread. In China the maximum price was about 52% in the middle of the growth curve, in South Korea the maximum price was 96% at the end of the 1st week of mass occurrence, while in Italy 267%, also during the 1st week of mass occurrence. . For China, the price was 14.2% at the peak and fell to 1.9% after 7 days, when it was now clear that the weakening phase had begun. In South Korea at the peak of the epidemic the price was 18.1%, and after 7 days 2.2%.

[DEATHS RATE 5d AVG]: A 5 days average of the increase rate of total number of deaths. In China, the maximum price was 49% at the beginning of the data sent to the WHO, at the peak of the cases it was 12% and 12 days later it dropped to 4.2%. In South Korea the maximum price was 100% 15 days after the start of the mass outbreak, at peak it was 24%, 10 days later it dropped to 3.8%, while it increased to 5.6% (24/3/2020) . In Italy the maximum value was 94%, 5 days after the onset of the massive outbreak and 10.2% on the worst day to date in terms of deaths (27/3/2020).

See the Pandemic monitoring

Raw data from:

World Health Organization COVID-19 Situation Dashboard

Johns Hopkins Coronavirus Resource Center

Εθνικός Οργανισμός Δημόσιας Υγείας

COVID-19 Coronavirus Pandemic, worldometers.info

"Health Care Resources". stats.oecd.org

Health at a Glance 2019: OECD Indicators, 9. Health care activities : Hospital beds and discharges rates