Table 2:

Calibration of the HOMR score in the derivation and validation cohorts

Calibration measure	Cohort
	Derivation n = 87*	Ontario n = 84*	Alberta n = 77*	Boston n = 65*
% of HOMR scores for which 95% CI of observed risk of death included expected risk of death	66.7	31.0	57.1	53.8
Difference between observed and expected % of patients dead at 1 yr
Relative,† %
Median (IQR)	0.05 (0.02 to 0.25)	0.17 (0.06 to 0.26)	0.09 (0.03 to 0.54)	0.26 (0.06 to 1)
Range	0–2.02	0–226.86	0–1.14	0–5.27
Absolute,‡ %
Median (IQR)	0.2 (0.02 to 0.72)	0.33 (0.09 to 2.78)	0.34 (0.03 to 1.95)	0.34 (0.05 to 1.76)
Range	0–4.46	0–8.72	0–11.1	0–39.35

Note: Boston = Brigham and Women’s Hospital, CI = confidence interval, HOMR = Hospital-patient One-year Mortality Risk, IQR = interquartile range.

^*n refers to the number of discrete values of the HOMR score represented by at least 1 patient within the cohort.

^†Relative difference was calculated as the absolute difference divided by the expected % dead at 1 yr.

^‡Absolute difference was calculated as observed % dead at 1 yr minus expected % dead at 1 yr.