Abstract:
Three longitudinal databases have been analyzed using parallel procedures. "Lost" subjects were defined as those who were eligible for follow-up but no information was collected from the person with TBI, or a proxy, for any reason (e.g. refused, expired, no response to contact, unable to be interviewed). Each database was analyzed separately for each follow-up year. Univariate analysis were first conducted to identify all variables in each dataset for which there was a difference (p