Table 1. Characteristics of participants.

		N	%
Total		62,005
Age at first visit, years, mean (SD)		46.7 (13.1)
Age at first visit, 10-year category
	<20	424	0.7%
	20–29	6,104	9.8%
	30–39	11,655	18.8%
	40–49	18,820	30.4%
	50–59	14,104	22.7%
	60–69	8,021	12.9%
	70–79	2,789	4.5%
	80–89	84	0.1%
	≥90	4	<0.1%
Year of birth	1890–1899	3	<0.1%
	1900–1909	67	0.1%
	1910–1919	825	1.3%
	1920–1929	4,328	7.0%
	1930–1939	9,847	15.9%
	1940–1949	18,713	30.2%
	1950–1959	13,697	22.1%
	1960–1969	9,400	15.2%
	1970–1979	4,487	7.2%
	1980–1989	632	1.0%
	1990–1999	6	<0.1%
BMI,* median (range)		21.1 (12.8–46.0)
Smoking*	Never	7,935	77.9%
	Ever	2,257	22.1%
Drinking*	Never	5,865	57.4%
	Ever	4,338	42.5%
	Unknown	16	0.2%

BMI, body mass index; SD, standard deviation.

^*Data obtained from the questionnaire at the first visit.