Methods and Results: Participants were 46 10th
graders in Wuhan who attended either a regular high
school (51%) or a vocational school (49%). The mean
age of the study participants was 16.2 (SD=0.4) years,
with a range from 16 to 17 years. Among the participants,
three were girls. All participants were of Han
ethnicity. The 46 participants were recruited from a
school-based screening assessment conducted in June
2000, two and one-half weeks prior to administration of
the baseline clinic assessment. The screening questionnaire
was completed by 622 10th grade students. The
two and one-half weeks that passed between the initial
assessment with the announcement about the availability
of the quit-clinic, and the first clinic session, permitted
a means of estimating naturally occurring cessation
among youth from the same clinic cohort. A total of
two of the 68 participants originally screened reported
having quit during this period. Thus, naturally occurring
quitting was estimated at 3%.