Table 2. Post hoc analyses for cumulative expulsion proportions for each week.

	Stone expulsion rate after 2 weeks		Stone expulsion rate after 3 weeks
Group Comparison	Difference	Critical Range	Difference	Critical Range
Group 1 vs. Group 2	0.211*	0.160	0.224*	0.158
Group 1 vs. Group 3	0.251*	0.159	0.286*	0.154
Group 2 vs. Group 3	0.040	0.135	0.062	0.118