Table 3

Calibration of the PIM model in district general hospital adult intensive care units

		Deciles of risk										Total
		1	2	3	4	5	6	7	8	9	10	Total
Hosmer and Lemeshow goodness of fit test: χ² = 4.55 (8 df), p = 0.8.
O/E, observed over expected; PIM, Paediatric Index of mortality.
Died	Observed	0	0	0	0	0	1	0	2	6	22	31
	Expected	0.2	0.4	0.3	0.5	1.0	1.5	1.9	2.5	4.6	20.4	33.2
	O/E ratio	0	0	0	0	0	0.7	0	0.8	1.3	1.1	0.9

Survived	Observed	40	42	30	38	38	36	37	36	31	15	343
	Expected	39.7	41.6	29.7	37.5	37.0	35.5	35.1	35.5	32.4	16.6	340.8
	O/E ratio	1.01	1.01	1.01	1.01	1.03	1.01	1.05	1.01	0.96	0.9	1.01

Total		40	42	30	38	38	37	37	38	37	37	374