Table 1.

Characteristics of the dataset.

Parameter	All patients	Training set	Validation set	Test set
No. of paired chest radiographs and clinical parameters	6798	4885	540	1373
No. of patients	6125	4396	472	1257
No. of male patients	3382 (55%)	2414 (55%)	264 (56%)	704 (56%)
Age (years) (range)	18—91	18—91	19—91	18—91
Mean age ± SD [Median] (years)	64 ± 16 [65]	64 ± 16 [65]	64 ± 16 [65]	64 ± 16 [65]
No. of deaths during hospital stay	1002 (16%)	717 (16%)	76 (16%)	209 (17%)

Data in parentheses are percentages. Note that the number (percentage) of deaths during the hospital stay for a given set is relative to the number of patients in each set.