Table 1.

Number of annotations per class used in the training, validation, and test sets of the CNN

Class	Training	Validation 1	Validation 2	Validation 3	Validation 4	Validation 5	Test Radboudumc	Test Mayo Clinic
Glomeruli	84	12	10	12	19	6	39	37
Sclerotic glomeruli	7	1	1	1	1	2	5	1
Empty Bowman’s capsules	5	2	1	1	3	1	5	3
Proximal tubuli	1941	433	253	139	346	145	636	1060
Distal tubuli	1321	274	224	141	248	156	374	579
Atrophic tubuli	1160	88	124	198	180	232	328	12
Undefined tubuli	883	186	42	174	222	73	495	69
Arteries	43	4	1	5	1	1	11	14
Interstitium	44	6	5	6	5	5	17	19
Capsule	4	2	1	1	1	1	4	—a

^aThe Mayo Clinic WSIs did not contain any capsular structures.