Serum bicarbonate may independently predict acute kidney injury in critically ill patients: An observational study

Table 1 Comparison of demographical and clinical characteristics at the time of admission to intensive care

	NO AKI(n = 1006)	AKI(n = 877)	P value
Age (yr)	61.4 (18.8)	66.2 (16.6)	< 0.0001
Sex, M:F	1.1:1 (726:662)	1.1:1 (242:220)	0.978
Requirement for mechanical ventilation	46%	51.5%	0.01
Severity of illness
APACHE III	47.8 (25.3)	63 (35.7)	< 0.0001
SAPS II	33.7 (13.8)	45.9 (17.6)	< 0.0001
Vital signs
Heart rate (/min)	99 (22)	105 (23)	< 0.001
Respiratory rate (/min)	24 (6.6)	26 (7.5)	< 0.001
Temperature1 (°C)	35.3 (0.9)	35.2 (1.2)	0.004
Systolic BP1 (mmHg)	102.9 (16.8)	96.5 (169)	< 0.001
Diastolic BP1 (mmHg)	55.8 (12.2)	52.3 (12.7)	< 0.001
MAP (mmHg)	71.3 (12.7)	67.0 (12.8)	< 0.001

¹Lowest. Data are presented in mean ± SD; number of patients where data were available for analyses. SAPS II: Simplified acute physiology score II; APACHE III: Acute physiology age and chronic health evaluation III; BP: Blood pressure; MAP: Mean arterial pressure.