Table 1.

Results of the test of heterogeneity.

Model	Studies	Reference-positive units	Reference-negative units	Correlation	Proportion of heterogeneity likely due to threshold effect
Alexnet	5	885	302	1	1
Densenet	17	15,831	2087	0.48	0.23
Efficientnet	8	1001	265	0.71	0.5
Inception	11	2494	522	−0.87	0.76
Mobilenet	7	2735	399	−1	1
Resnet	36	14,356	1931	0.63	0.39
VGG	15	3047	485	0.36	0.13

This table is shown to present the models’ information of the heterogeneity. After the Cochran’s Q test and inconsistency index (I²) test, the statistics are shown in the table. The number of studies, the number of reference-positive units, the number of reference-negative units, the correlation and proportion of heterogeneity likely due to threshold effect of each model is explained.