Table 3. Dataset Subdivisions for Model Fitting (Training and Validation), Testing and Blind Test^a.

model	COVID-19 diagnosis (M1) (n = 1082)			risk assessment (M2) (n = 437)			low-risk discrimination (M3) (n = 595)
class	positive	negative	subtotal	severe	mild	subtotal -	mild	negative	subtotal
training	260	231	491 (45)	94	104	198 (45)	113	140	253 (13)
validation	105	95	200 (18)	37	43	80 (18)	34	42	76 (13)
testing	57	53	110 (10)	19	23	42 (10)	23	28	51 (9)
blind test	231	50	281 (26)	41	76	117 (27)	76	139	215 (36)

^aNumbers correspond to individual (N) average and percentages in parentheses.