Table 2.

Comparisons of serum amylase level of patients before and after ERCP between two groups (U/L).

Group	Cases	Before ERCP	3 h after ERCP	12 h after ERCP	24 h after ERCP
Control group	72	95.86±11.76	183.27±13.68*	238.75±16.45*	162.75±15.13*
Observation group	67	95.72±11.98	138.65±12.62*	182.83±16.34*	101.63±15.28
P		0.944	<0.001	<0.001	<0.001

Compared with that before ERCP,

^*P<0.05.