Multiphasic epidemiological analyses on smoking habits among undergraduate students in Japan.

TL;DRAbstract

Little is known about the prevalence and dynamics of smoking habits among university students in Japan, and their association with other lifestyle parameters and biological markers. Data on undergraduate students were here extracted from the questionnaire and laboratory tests of the periodic health checkup of Kyoto University in 2000 and 2001. In addition to simple statistics, longitudinal analyses were performed using logistic regression, and the odds ratio (OR) and its 95% confidence interval (CI) were calculated for each item. Among 11,203 subjects, 12.1% had a smoking habit. The smoking rate was higher in men than in women (14.4% vs 2.4%, P<0.001) and increased from 2.5% (freshmen) to 18.3% (seniors) with advance in year. During one year of follow-up, 5.8% of students newly acquired a smoking habit, and 12.4% of smokers abandoned the habit. Compared with students majoring in natural sciences, the majors in humanities or social sciences were more likely to begin smoking (OR=1.32, 95

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