Table 1

Number and type of event in each group for comparison

Derivation sample (n=317)Internal validation sample (n=263)External validation sample (n=264)
No event187 (59%)132 (50%)122 (46%)
Event
 Death65 (20.5%)49 (19%)43 (17%)
 Urgent surgery65 (20.5%)82 (31%)99 (37%)