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Table 3 Outcomes for the derivation, geographic and temporal external sub-cohorts

From: Derivation and validation of a prognostic model for postoperative risk stratification of critically ill patients with faecal peritonitis

Cohort Derivation (UK until Jan 2011) Geographic validation (non-UK) Temporal validation (UK post-Jan 2011)
Total number of patients 462 515 323
Characteristics
Length of stay (days) Median IQR Median IQR Median IQR
Available data 462 100% 515 100% 322 99.7%
 ICU 7 4–14 14 7–29 6 3–11
 Hospital 26 14–47 30 17–54 29 18–47
Mortality n % n % n %
Available data 462 100 515 100 321 99.4
 6 month 124 26.8 185 35.9 64 19.9
 ICU 73 15.8 131 25.4 24 7.5
 Hospital 109 23.6 171 33.2 29 9.8
 28 day 79 17.1 171 33.2 40 12.4