Table 3.

The NT (days) study in cases and normal gallbladder bile.

	Cases	Normal
Tris-HCl (10 mM/L)	6.04±1.99	22.13±2.23
OPN (100 μg/ml)	10.81±1.55*	25.33±2.41*
Calcium ions (10mM/L)	3.63±1.36	15.47±1.51
OPN + calcium ions	8.67±1.64**	20.27±1.53**

^*P<0.01, compared with Tris-Hcl;

^**P<0.01, compared with calcium ions.