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Table 1 Incidence rates (including all individual nephrolithiasis (NL) events without exclusion of subjects with NL before start of follow up) for NL in patients with gout and general population (GP) controls by sex and age groups and overall, with 95% confidence interval

From: Incidence of and risk factors for nephrolithiasis in patients with gout and the general population, a cohort study

  Gout cases (n = 29,968) GP controls (n = 138,678)
  NL events, n Person-years at risk, n Incidence rate per 1000 person-years (95% CI) NL events, n Person-years at risk, n Incidence rate per 1000 person-years (95% CI)
Women
 20‒39 years 8 1130 7.2 (3.2‒14.0) 18 5487 3.3 (1.9‒5.2)
 40‒59 years 44 6363 6.9 (5.0‒9.3) 64 32,015 2.0 (1.5‒2.6)
 60‒79 years 74 17,043 4.3 (3.4‒5.5) 212 87,677 2.4 (2.1‒2.8)
 80+ years 35 9598 3.7 (2.5‒5.1) 71 51,216 1.4 (1.1‒1.8)
Men
 20‒39 years 35 4571 7.7 (5.3‒10.7) 68 22,323 3.1 (2.4‒3.9)
 40‒59 years 177 23,267 7.6 (6.5‒8.8) 552 115,562 4.8 (4.4‒5.2)
 60‒79 years 266 37,896 7.0 (6.2‒7.9) 966 187,501 5.2 (4.8‒5.5)
 80+ years 39 10,205 3.8 (2.7‒5.2) 174 49,622 3.5 (3.0‒4.1)
Women 161 34,134 4.7 (4.0‒5.5) 365 176,395 2.2 (1.9‒2.3)
Men 517 75,939 6.8 (6.2‒7.4) 1760 375,008 4.7 (4.5‒4.9)
Total 678 110,073 6.2 (5.7‒6.6) 2125 551,403 3.9 (3.7‒4.0)