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Of the original sample of 230 participants, 91 (39.6%) did not participate in the twelve month follow-up. Of these, 42 had also not been seen at the three month follow-up. Information regarding a total of 50 of them was obtained. Seventeen of them were known to have moved (including the one who had joined the army) and addresses for five of these were obtained; however they declined to respond to postal questionnaires. Twenty-five participants were known to be in prison and not contacted; there was a warrant for the arrest of another participant and his whereabouts were unknown. Two participants were known to have become homeless and could not be located. Five had died during the entire follow-up period, all male, three young heroin users and two alcohol users (see Table 7.3).
Table 7.3
Seen at follow-up
Level 1 follow-up
Level 2 follow-up
Level 3 follow-up
Seen - no follow-up data
Not seen at follow-up
Accounted for - not seen
Not accounted for
TOTAL
The proportion of
set at the beginning of the study, but identification of respondents seen at both the follow-up points revealed that, of the 139 individuals from whom data were collected twelve months, 101 had participated in the three month follow-up as well. Thus, a total of 43.9% of the original sample participated at all three data collection points.
Study participants traced at twelve month follow-up (t3)
No. of attempts
100 127 23 n/a
n/a n/a
No. study % Cumulative participants %
92 40.0 40.0 42 18.2 58.2 5 2.2 60.4 13 5.6 66.0
50 21.8 87.8
28 12.2 100 230 100 100
respondents seen at the twelve month follow-up met the target of 60%
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