Table 5.

Comparison of stone excretion time between two groups ($\overline{x}\pm s$).

Groups	n	Stone expulsion time (d)
		Before	After
Control group	45	12.87 ± 5.19	11.98 ± 6.87
Observation group	45	5.61 ± 1.37	8.54 ± 4.17
t	—	8.261	2.679
P	—	<0.001	0.008