Table 1.

Age and gender characteristics between subjects eligible but not enlisted and subjects eventually enlisted in the Mollerussa cohort

	Eligible but not enlisted			Enlisted (n=602)
	Failed to be contacted (n=448)	Declined to participate (n=349)	All (n=797)
Gender (female), n (%)	181 (40.4)	170 (48.7)	351 (44.0)	353 (58.6)*
Age, years, mean (SD)	44 (15.0)	47.9 (16.3)	45.7 (15.7)	48.1 (13.4)†
Age group, years, n (%)
<40	218 (48.7)	140 (40.1)	358 (44.9)	168 (28.2)
40–60	160 (35.7)	125 (35.8)	285 (35.8)	315 (52.9)
>60	70 (15.6)	84 (24.1)	154 (19.3)	113 (19.0)

*χ² test, p<0.001.

†Kruskal-Wallis non-parametric test, p<0.001.