Table 2

Mean age and male/female ratio during repeated screening

	Screening group						Control group
	Subjects alive		Subjects invited		Subjects screened		Subjects alive
Screening round	Mean age	M/F ratio	Mean age	M/F ratio	Mean age	M/F ratio	Mean age	M/F ratio
1	59.8	0.92	59.8	0.92	58.8	0.89	59.8	0.92
2	61.6	0.91	60.7	0.87	60.5	0.87	61.7	0.91
3	63.4	0.89	62.4	0.86	62.2	0.86	63.4	0.89
4	65.2	0.87	64.0	0.85	63.8	0.86	65.1	0.87
5	66.8	0.85	65.6	0.84	65.2	0.85	66.8	0.85
6	68.5	0.84	67.1	0.83	66.6	0.85	68.5	0.83
7	70.0	0.81	68.4	0.82	68.0	0.84	70.0	0.81