Should we support prophylactic intervention for asymptomatic kidney stones? A retrospective cohort study with long-term follow-up

Table 2 Details of Primary and Secondary Outcomes

	Overall (N = 120)	Control group (N = 79)	Exposure group (N = 41)	p value
Stone-related events^a	45 (37.5%)	40 (57.0%)	5 (12.2%)	< 0.001*
Time to events, ^bmonths	15.0 (9.0–32.5)	14.5 (9.0–28.8)	36.0 (14.5–43.5)
Pain	18 (15.0%)	16 (20.3%)	2 (4.9%)
Hydronephrosis	17 (14.2%)	15 (19.0%)	2 (4.9%)
Stone growth	10 (8.3%)	8 (10.1%)	2 (4.9%)
Serious infection	2 (1.7%)	2 (2.6%)	0 (0%)
Gross hematuria	5 (4.2%)	4 (5.1%)	1 (2.4%)
Spontaneous passage	16 (13.3%)	16 (20.3%)	0 (0%)
Future intervention^a	25 (20.8%)	23 (31.6%)	2 (4.9%)	0.002*
Time to intervention, ^bmonths	24.0 (9.0–34.0)	19.0 (9.0–28.0)	37.5 (31.0–44.0)