Instability in smoking patterns among school leavers in Victoria, Australia
Penelope E Schofielda, Ron Borlanda, David J Hilla, Philippa E Pattisonb, Marienne E Hibbertc
a Centre for Behavioural
Research in Cancer, Anti-Cancer Council of Victoria, Carlton South,
Victoria, Australia, b Department of Psychology, University of Melbourne,
Melbourne, Victoria, c Centre for Adolescent
Health, Royal Children's Hospital, Melbourne
Correspondence to: Dr PE Schofield, Centre for Behavioural Research in Cancer, 1 Rathdowne Street, Carlton South, Victoria 3053, Australia. penny{at}accv.org.au
OBJECTIVE
To describe patterns of smoking in a
cohort of young adults over the first 15 months after leaving school.
DESIGN
A four-wave, longitudinal survey design was
used to gather data. Final-year students from 93 schools completed the
recruitment questionnaire at an average age of 17 years. Follow-up
questionnaires were posted to their home addresses three months, nine
months and 15 months after the end of school.
SETTING
Victoria, Australia.
PARTICIPANTS
A cohort of 1903 respondents who
completed and returned all four questionnaires.
MAIN OUTCOME MEASURES
Self-labelled smoking status
("heavy smoker", "light smoker", "occasional smoker",
"ex-smoker", and "non-smoker"), daily cigarette consumption,
and maximum daily cigarette consumption.
RESULTS
At school, 72% of the sample were
"non-smokers", 5% "ex-smokers", 11% "occasional", 8%
"light", and 5% "heavy smokers". At 15 months after school,
these proportions had shifted to 64%, 8%, 11%, 9%, and 7%,
respectively. Over the study, "light smokers" and "heavy
smokers" substantially increased their daily consumption; "occasional" and "ex-smokers" did not. There was relatively
high stability in self-labelled smoking status at one wave and the next. However, over the four waves, 38% of the sample changed their
self-labelled smoking status, and 41% of these had been "non-smokers" at school. A reduced second-order Markov chain model was found to fit this four-wave behavioural sequence. Detailed description of smoking status changes revealed greater progression to
higher levels of smoking than transition to lower levels.
CONCLUSIONS
There is considerable flux in smoking
patterns among young adults after leaving school, suggesting an
opportunity to intervene with smoking prevention programmes at this
stage of development.
Keywords: smoking patterns; young adults; Australia
© 1998 by Tobacco Control
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