Table 2.

Prescription of medications that affect urinary stone recurrence during the first year after incident stone diagnosis

MedicationWithout 24-h Urine Test (N=113,186; 87%)With 24-h Urine Test (N=17,303; 13%)Percentage Difference in Proportions (95% CI)a
Participants receiving medication during first year after diagnosis (N, %)
 Thiazides19,372 (17%)4172 (24%)7 (6.3 to 7.7)
 Alkali4882 (4%)2918 (17%)13 (12.0 to 13.1)
 Allopurinol7526 (7%)1817 (11%)4 (3.4 to 4.3)
Difference from baseline in proportion of participants receiving medication (% absolute change)
 Thiazides0.288 (6.9 to 8.4)
 Alkali31512 (11.7 to 12.8)
 Allopurinol154 (3.4 to 4.4)
  • a Percentage difference in proportions is the proportion of patients with active prescription of medication in 1 yr after stone diagnosis or 24-h urine test minus the proportion of patients with active prescription of medication in 1 yr before stone diagnosis or 24-h urine test.