during
new student orientation in the summer prior to entering
a large, public university in the mid-Atlantic region of
the United States. The first-stage response rate was 89%.
The initial sample represented almost 90% of the incoming
class, and did not differ significantly from the class
with respect to demographic characteristics [37]. Second,
a stratified random sample of screener participants was
selected for longitudinal followup, with oversampling for
experienced drug users. Sampling weights were calculated
so that prevalence estimates could be adjusted for bias
introduced by oversampling. The second-stage response
rate was 86% of those contacted for follow-up. The follow-
up sample (n = 1,253) was interviewed face-to-face
by a trained interviewer at some time during their first
year of college. Students were paid $5 for completing the
screener survey and $50 for completing the personal interview.
The study was reviewed and approved by the University
Institutional Review Board, a federal Certificate of
Confidentiality was acquired, and informed consent was
obtained from participants at all stages. Additional details
describing the recruitment, sampling methods and representativeness
of the sample can be found elsewhere
duringnew student orientation in the summer prior to enteringa large, public university in the mid-Atlantic region ofthe United States. The first-stage response rate was 89%.The initial sample represented almost 90% of the incomingclass, and did not differ significantly from the classwith respect to demographic characteristics [37]. Second,a stratified random sample of screener participants wasselected for longitudinal followup, with oversampling forexperienced drug users. Sampling weights were calculatedso that prevalence estimates could be adjusted for biasintroduced by oversampling. The second-stage responserate was 86% of those contacted for follow-up. The follow-up sample (n = 1,253) was interviewed face-to-faceby a trained interviewer at some time during their firstyear of college. Students were paid $5 for completing thescreener survey and $50 for completing the personal interview.The study was reviewed and approved by the UniversityInstitutional Review Board, a federal Certificate ofConfidentiality was acquired, and informed consent wasobtained from participants at all stages. Additional detailsdescribing the recruitment, sampling methods and representativenessof the sample can be found elsewhere
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