Table 2 Training, validation, and test set distributions.

From: Machine learning generalizability across healthcare settings: insights from multi-site COVID-19 screening

 

Oxford University Hospitals (pre-pandemic and wave 1 cases, to 30 June 2020)

Oxford University Hospitals

Portsmouth University Hospital NHS Trust

University Hospitals Birmingham NHS Foundation Trust

Bedfordshire Hospitals NHS Foundation Trust

Training Set

91,970 (negative)

556 (positive)

NA

21,555 (negative)

1182 (positive)

5920 (negative)

255 (positive)

620 (negative)

85 (positive)

Validation Set

22,987 (negative)

145 (positive)

NA

7140 (negative)

439 (positive)

1966 (negative)

93 (positive)

206 (negative)

30 (positive)

Test Set

NA

20,845 (negative)

2012 (positive)

7196 (negative)

384 (positive)

1968 (negative)

91 (positive)

207 (negative)

29 (positive)