Table 1.

Characteristics of study participants.

	Overactive bladder
	No		Yes
Age (years), mean (sd)	33.4	(7.6)	34.1	(7.8)
Birthyear
1959–1964	2707/11637	(23.3)	271/1033	(26.2)
1965–1969	2288/11637	(19.7)	210/1033	(20.3)
1970–1974	2190/11637	(18.8)	184/1033	(17.8)
1975–1979	2064/11637	(17.7)	181/1033	(17.5)
1980–1985	2388/11637	(20.5)	187/1033	(18.1)
Educational level
Elementary school	512/11511	(4.4)	50/1020	(4.9)
High school	5631/11511	(48.9)	482/1020	(47.3)
College/university	5368/11511	(46.6)	488/1020	(47.8)
Obesity (BMI>30)	589/11341	(5.2)	83/1022	(8.5)
Pregnancy	7029/10970	(64.0)	618/925	(66.8)
Snuff users	311/8979	(3.5)	22/762	(2.9)
Smokers	655/8980	(7.3)	46/761	(6.0)

Figures are number of subjects (%) unless specified.

BMI denotes body mass index.