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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
Objective To understand the acceptability of telephone survey by urban residents and evaluate the validity and reliability of telephone surveys of respondents. Methods In 2006, we conducted a randomized telephone screening survey in Beijing, Shanghai and Hong Kong. We successfully invited 300 women aged 20 to 49 in our study. As a result, 246,600 telephone numbers were allocated to the screening, of which 95% were dial-up within 5 times. The average number of “agree” numbers is twice the number of dial-up attempts, and the response rate and rejection rate do not increase synchronously as the number of dial-up increases. Beijing sample bank has low validity but high response rate; both of Shanghai indicators are satisfactory; Hong Kong sample bank is more effective but its response rate is partial. The overall response rate for telephone screening was 42%, with the lowest response rate (32%) in Hong Kong (P <0. 001) compared to Beijing (47%) and Shanghai (50%). Conclusions Chinese urban residents can accept the telephone survey method and the sample response rate is satisfactory