Table 2 Definition of derivation and validation cohorts and the distribution of analysis units in the cohorts (evaluated at discharges following the first diagnosis)
From: A framework for feature extraction from hospital medical data with applications in risk prediction
Derivation cohort | Validation cohort | |
|---|---|---|
Diabetes | ||
Period | 2003-2007 | 2008-2011 |
Number of patients | 4,930 | 2,101 |
Number of analysis units | 11,897 | 4,041 |
COPD | ||
Period | 2003-2008 | 2009-2011 |
Number of patients | 1,816 | 1,816 |
Number of analysis units | 5,746 | 5,270 |
Mental disorders | ||
Period | 2003-2009 | 2010-2011 |
Number of patients | 3,089 | 1,248 |
Number of analysis units | 10,728 | 2,232 |
Pneumonia | ||
Period | 2003-2008 | 2009-2011 |
Number of patients | 3,258 | 2,264 |
Number of analysis units | 7,817 | 4,020 |