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

	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)