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我们于1989年5月对淄博市随机抽取城区重点及非重点中学各1所,每年级4个班;农村普通中学及师专各1所,每年级2个班,共1777人。采用现场无记名答卷调查法,调查了学生吸烟情况。结果可见,对吸烟的态度是随年级上升
In May 1989, we randomly selected 1 primary and secondary non-key middle school in Zibo City, each of which had 4 classes in each year; 1 in rural ordinary middle schools and 1 in teachers’ colleges, and 2 classes in 1 class each year. The student’s smoking status was investigated using an on-site anonymous questionnaire survey. The results show that the attitude towards smoking increases with grades.