Acute and chronic kidney disease in elderly patients with hip fracture: prevalence, risk factors and outcome with development and validation of a risk prediction model for acute kidney injury

Table 11 Calibration of the Nottingham Hip Fracture – Risk Score for Kidney Injury (NH-RISK)

NH-RISK score	Predicted risk	Observed rate of AKI (number/group size)
		Full set	Training set	Test set
0	0.09	0.046 (5/109)	0.067 (5/75)	0 (0/34)
1	0.12	0.107 (14/131)	0.125 (12/96)	0.057 (2/35)
2	0.15	0.094 (3/32)	0.15 (3/20)	0 (0/12)
3	0.18	0.172 (102/592)	0.171 (67/391)	0.174 (35/201)
4	0.22	0.244 (206/843)	0.247 (137/554)	0.239 (69/289)
5	0.27	0.268 (134/500)	0.264 (87/329)	0.275 (47/171)
6	0.32	0.291 (125/430)	0.286 (80/280)	0.3 (45/150)
7	0.37	0.425 (76/179)	0.427 (47/110)	0.42 (29/69)
8	0.43	0.563 (18/32)	0.52 (13/25)	0.714 (5/7)

ISSN: 1471-2369