Table 3.

Summary of different type of lung disease and normal (healthy patients) X-ray images used by papers

Paper	Normal	Pneumonia	COVID-19	Total images
[63]	25	N/A	25	50
[27]	50	N/A	50	100
[28]	504	700	224	1428
[29]	N/A	1431	100	1531
[22]	1583	4290	68	5941
[49]	1579	1485	423	3497
[30]	15	N/A	25	40
[31]	85	N/A	85	170
[50]	N/A	5551	358	5909
[54]	3450	N/A	455	3905
[86]	8066	5538	259	13,863
[32]	207	N/A	207	414
[33]	N/A	320	135	455
[87]	179	179	179	537
[34]	310	654	284	1248
[66]	7595	8792	313	16700
[58]	N/A	N/A	120	120
[35]	8851	6054	180	15085
[88]	2400	2600	536	5536
[23]	127	127	127	381
[59]	137	N/A	137	274
[36]	350	322	225	947
[37]	8066	5521	183	13,770
[38]	44,993	14,777	167	59,937
[39]	9039	2306	318	11,663
[89]	8851	6045	215	15,111
[40]	1591	4706	105	6402
[41]	191	131	180	502
[53]	1000	54	90	1144
[90]	N/A	N/A	462	462
[51]	8066	5551	358	13,975
[69]	80	N/A	105	196
[24]	1000	1000	239	2239
[70]	N/A	N/A	423	710
[91]	1579	2760	462	4801
[42]	15,000	15,000	99	30,099
[43]	8851	6045	386	15,282
[71]	1126	NS	1050	114,742
[72]	388	1000	500	2191
[92]	2880	5179	415	8474
[25]	1000	2000	309	3309
[48]	25	N/A	25	50
[44]	N/A	120	326	1312
[60]	3520	500	250	4281
[67]	N/A	1583	305	1888
[52]	13410	13,450	8640	35,500
[45]	554	554	154	1262
[46]	505	512	236	1253
[61]	377	N/A	377	754
[47]	668	619	132	1419
Total	168,223	127,456	21,062	430,679