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吸烟有害健康 ,被动吸烟同样有害健康。本文对 196 7名小学生被动吸烟情况及其与几种呼吸系统疾病发病的关系进行了调查。结果报告如下。材料与方法 (1)调查对象 :选取辽宁省沈阳市市区小学一所 ,市郊小学一所 ,宽甸满族自治县村级小学一所 ,采用问卷与体检相结合的方式 ,共?
Smoking is harmful to health and passive smoking is also harmful to health. In this paper, 196 7 primary school students passive smoking and its relationship with several respiratory diseases were investigated. The results are reported below. MATERIALS AND METHODS (1) Subjects: One primary school in Shenyang City, one primary school in Shenyang, and one village primary school in Kuandian Manchu Autonomous County were selected. The questionnaire and physical examination were used in combination.