电话膳食调查方法在北京、上海和香港应用研究—1电话抽样筛查的可行性

目的　了解城市居民对电话调查的接受程度 ,以及选取调查对象进行电话膳食调查的有效性和可靠性评价。方法　 2 0 0 2年在北京、上海和香港开展了一项电话随机抽样筛查 ,成功邀请到 30 0名 2 0～ 4 9岁的城市妇女参与本研究。结果　筛查中共拨出 2 4 6 2个电话号码 ,其中 95 %的号码在 5次以内完成拨号。“同意”号码平均拨号次数为两次 ,应答率和拒绝逆转率并不因拨号次数增加而同步增长。北京样本库的有效性偏低但应答率较高 ;上海两项指标均令人满意 ;香港样本库的有效性较高但应答率偏底。电话筛查的总体应答率为 4 2 % ,与北京 (4 7% )和上海 (5 0 % )相比 ,香港的应答率 (32 % )最低 (P <0 .0 0 1 )。结论　中国城市居民可以接受电话访问的调查方式 ,抽样应答率令人满意

Feasibility of telephone screening interview in a validity and reliability study of telephone interview to assess dietary intake in Beijing,Shanghai and Hong Kong

Objective To understand the feasibility of telephone interviews to achieve recruitment of subjects to assess the validity and reliability of the telephone interview in eliciting dietary intake. Methods A multi phase study was conducted in Beijing, Shanghai and Hong Kong in 2002. Results Three hundred eligible women aged from 20 to 49 years old were recruited in those cities. In the screening interview, 2462 random telephone numbers were dialed with 95% of dials completed within 5 times of attempts. The average number of dial for the completion was two calls, the rates of completion and refusal conversion were not improved remarkably by the increase of calls although some calling attempts reached 20 times. Regarding the processing of the sampling pools in those three cities, Beijing had a lower efficiency rate but a satisfactory completion rate, Shanghai was good in both indicators, and Hong Kong had a good efficiency rate but lower completion rate.The overall telephone screening interview completion rate was 42%, with Hong Kong having the lowest rate (32%) compared with Beijing and Shanghai (47% and 50%, respectively, P <0.001). Conclusion The telephone interview method could successfully reach the target of urban Chinese women and earn their cooperation with a satisfactory completion rate.