43 093 participants aged 18 years and older.
Of these, 39 959 were eligible for wave 2
(follow-up) interviews. Ineligible participants
were, at the time of the follow-up interview,
deceased, deported, mentally or physically
impaired, or on active military duty. A total of
34 653 eligible wave 1 participants were successfully
followed up in the wave 2 survey
between 2004 and 2005. The response rates
for wave 1 and eligible wave 2 surveys were
81% and 87%, respectively.32