Table 3: Risk of in-hospital death and developing a high postoperative inflammatory response (HPIR) in older patient with hip fracture by the level of urea at admission.

Model Urea 7.5 -10.0 mmol/L
(n=410) 		Urea >10.0 mmol/L
(n=390) 		Urea >7.5 mmol/L
(n=800)
OR 95%CI P value OR 95%CI P value OR 95%CI P value
In-hospital mortality
1 1.82 1.07-3.10 0.028 4.41 2.80-6.96 <0.001 3.00 1.98-4.54 <0.001
2 1.62 1.02-2.78 0.049 3.70 2.31-5.91 <0.001 2.60 1.70-3.98 <0.001
3 1.52 0.91-2.87 0.102 1.96 1.03-3.73 0.041 1.82 1.07-3.10 0.027
4 4.09 1.05-22.43 0.05 6.62 1.32-33.16 0.021 3.10 1.03-10.16 0.044
High postoperative inflammatory response (HPIR)
1 1.82 1.02-3.61 0.046 2.17 1.06-4.43 0.034 2.05 1.16-3.64 0.014
2 2.17 1.06-4.43 0.034 1.91 1.02-3.90 0.04 2.21 1.21-4.01 0.009
3 2.15 0.99-4.73 0.052 2.12 1.02-3.02 0.041 2.18 1.07-4.42 0.031

Abbreviations: OR, odds ratio; CI, confidence interval. Notes: Patients with admission urea<7mmol/L (n=1019) was the reference group (OR 1.0). Model 1, unadjusted analysis; Model 2, adjustment for age and gender; Model 3, adjustment for all admission variables with p≤0.010 on univariate analysis; Model 4, adjustment as in Model 3 and for HPIR (with CRP>150mg/L).