Methods a cross sectional survey of 284 smoking households with a infant in the city of Lu an,in Anhui provinc was carried out,and urinary cotinine to creatinine ratios in infants were measured.

• 方法采用问卷,调查婴儿父母家庭控烟知识、行为;采用高压液相色谱法检测婴儿尿液中可替宁含量。