Table 1

Response by cohort

		Gulf				Non-Gulf				Total
		Main				Non-Gulf				Total				Validation				Both
		n	%			n	%			n	%			n	%			n	%
Initial cohort	4795	—		4790	—		9585	—		4787	—		14372	—
Died before contact	40	—		40	—		80	—		38	—		118	—
Long questionnaire	4008	84.3		4077	85.8		8085	85.1		3935	82.9		12020	84.3
Short questionnaire	65	1.4		53	1.1		118	1.2		46	1.0		164	1.2
MAP responder	3	0.1		4	0.1		7	0.1		—	—		7	0.0
Refusal	61	1.3		55	1.2		116	1.2		67	1.4		183	1.3
No contact	618	13.0		561	11.8		1179	12.4		701	14.8		1880	13.2
Total eligible	4755	100		4750	100		9505	100		4749	100		14254	100