Blood Urea Nitrogen as a Predictor of Severe Acute Pancreatitis Based on the Revised Atlanta Criteria: Timing of Measurement and Cutoff Points

Table 1

Univariate analysis of predictive factors of SAP in 671 patients.

Variable	No SAP	SAP	P values
Age (yr)	47 (37, 63)	51.5 (38.5, 66)	0.1441
Male (%)	63.3	53.3	0.1270
Biliary etiology (%)	265 (43.4)	19 (31.7)
BMI (kg/m^2)	23.5 (21.1, 26.1)	24.2 (22.1, 26.6)	0.1041
WBC (10^9/l)	13.2 (10, 16.77)	15.3 (11.09, 18.365)	0.0185
Hemoglobin (g/l)	144 (129, 158)	149.5 (136, 164.5)	0.0722
Platelet (10^9/l)	198 (233, 160)	172 (209.5, 134)	0.0070
Potassium (mmol/l)	3.98 (3.70, 4.25)	4.02 (3.65, 4.70)	0.1443
Sodium (mmol/l)	139 (141, 136)	137 (142, 133)	0.1390
Calcium (mmol/l)	2.19 (2.28, 2.07)	1.9 (2.195, 1.58)	<0.001
BUN (mmol/l)	4.7 (3.7, 5.9)	7.45 (5.45, 11.95)	<0.001
BUN (24 h) (mmol/l)	4.6 (3.4, 6.2)	9.4 (6.15, 12.35)	<0.001
Scr (umol/L)	64 (54, 76)	82.5 (58, 157.5)	<0.001
Scr (24 h) (umol/L)	63 (52, 77)	92 (66, 206.5)	<0.001

Single continuous variables as median and interquartile range (25th–75th percentiles).