Challenges to be overcome using population-based sampling methods to recruit veterans for a study of post-traumatic stress disorder and traumatic brain injury

Table 1 The frequency of individuals who were successfully contacted as a function of group membership in the New Generation Study

		New generation group membership				Total
		TBI	PTSD	TBI and PTSD	Neither TBI nor PTSD
Contacted and screened (n)		4	8	15	39	66
Contacted but not screened (n)		15	8	9	47	79*
χ² (screened vs. not screened)		7.88**
df		3
Reason not screened	Not interested	8	1	5	23	37
	Initial contact only	6	5	3	16	30
	Too Far	1	2	0	7	10
	Pregnancy	0	0	0	1	1
	Deployment	0	0	1	0	1

*One of the 80 individuals contacted but not screened did not have a New Generation study diagnosis. **Fewer individuals with a diagnosis of TBI were screened than would be expected by chance alone (p<.05).

ISSN: 1471-2288