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Table 2 Details of Primary and Secondary Outcomes

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

  Overall
(N = 120)
Control group
(N = 79)
Exposure group
(N = 41)
p value
 Stone-related eventsa 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 interventiona 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)  
  1. *Values are statistically significant
  2. aData presented as frequency (%)
  3. bData presented as median (interquartile range)