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Table 1 Characteristics of patients and stones before matching

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

Variables All patients
(N = 120)
Control group
(N = 79)
Exposure group
(N = 41)
p value
 Body mass index (BMI)a, kg/m2 24.4 ± 2.4 24.7 ± 2.6 23.9 ± 1.9 0.065
 Ageb, years 48.0 (35.3–59.0) 55.0 (42.0–62.0) 37.0 (34.0–46.0)  < 0.001*
 Follow-up timeb 63.0 (43.8–78.0) 68.0 (43.0–82.0) 57.0 (47.0–70.0) 0.106
 Stone sizeb, mm 5.0 (3.0–6.0) 4.6 (3.0–6.0) 5.0 (3.5–6.0) 0.305
 Sex (male)c 102 (85.0%) 66 (83.5%) 36 (87.8%) 0.535
 Profession (pilot)c 69 (57.5%) 36 (45.6%) 33 (80.5%)  < 0.001*
 Multiple stones (yes)c 47 (39.2%) 32 (40.5%) 15 (36.6%) 0.676
 Location (not lower)c 96 (80.0%) 68 (86.1%) 28 (68.3%) 0.021*
 Prior history (yes)c 27 (22.5%) 21 (26.6%) 6 (14.6%) 0.137
 Hyperuricemia (yes)c 26 (21.7%) 21 (26.6%) 5 (12.2%) 0.070
  1. *Values are statistically significant
  2. aData presented as mean ± standard deviation, tested by Student’s t test
  3. bData presented as median ± interquartile range, tested by Mann–Whitney U test
  4. cData presented as frequency (%), tested by Pearson’s chi-square test