Table 1.

Age- and sex-distribution of the groups

	Mean age	Women	Men	% Women
1 ticket	51.7	140	110	56.0
2 tickets	51.2	133	117	53.2
2 tickets later	51.5	123	127	49.2
50 NOK	51.0	126	124	50.4
Controls	51.4	197	303	39.4
All groups	51.4	719	781	47.9