Table 2.

Available databases for COVID-19 (public data sets with severity rating labels available for the current study).

Name of Database	Year of Data Collection	Type of Labels	Public Available	Severity COVID19 Rate	Number of Images
Cohen et al. [27]	2020	Defined by other paper [9]: if “survival” is false, it is called “high severity”; if “survival” and “went-ICU” are true, it is termed “moderate severity”; if “survival” is true and “went-ICU” is false, it is named “low severity”	yes	yes	679 X-ray images from 412 patients
BrixIA [28,29,30]	2020	The lungs were divided into six regions and each region was scored ranging from 0 to 3. Consensus from 5 radiologists	yes	yes	4695
COVIDGR [23,31]	2020	Data were rated by 1 radiologist as negative, mild, moderate, or severe	yes	yes	852
MIDRC [32]	2022	Data were rated by 3 radiologists as negative, mild, moderate, or severe	yes	yes	823 with severity labels for COVID-19