D'Avanzo B, La Vecchia C, Katsouyanni K, Negri E, Trichopoulos D
Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy.
Eur J Cancer Prev. 1997 Jun;6(3):288-93. doi: 10.1097/00008469-199706000-00006.
In order to assess the comparability and reproducibility of information from a questionnaire used in a case-control study on digestive tract cancers conducted in Italy, a total of 400 subjects were randomly selected from a large sample of hospital controls and contacted at home to repeat the interview. Of these, 294 (73%) subjects were re-interviewed. Mean values of intake were computed for the 400 subjects selected, and among the 294 responders for the first and second interview. These values were comparable, most of them being within a 10% range. Spectrum correlation coefficient (rs) values of consumption between the first and second interview were > 0.65 for consumption of pastries, pasta or rice, bread, fish, milk, green vegetables, eggs and apples; between 0.50 and 0.65 for meat, chicken, liver, ham, cold cuts, cheese, fruit, cabbage, carrots, tomatoes, peppers, salad, citrus fruit and melon; and lower than 0.50 for a few infrequently eaten foods. For all foods, the estimated average weekly intake in the second interview increased consistently and substantially with increasing tertile of the first interview. This study shows a satisfactory comparability of dietary information from subjects interviewed at home with that provided during their original interview in the hospital, and a good reproducibility of information collected in the two settings.
为评估意大利一项消化道癌症病例对照研究中所使用问卷信息的可比性和可重复性，从大量医院对照样本中随机选取了400名受试者，并在家中对其进行回访以重复访谈。其中，294名（73%）受试者接受了再次访谈。计算了所选取的400名受试者以及294名首次和第二次访谈受访者的摄入量均值。这些值具有可比性，大多数在10%的范围内。首次和第二次访谈之间糕点、面食或米饭、面包、鱼、牛奶、绿色蔬菜、鸡蛋和苹果的消费光谱相关系数（rs）值>0.65；肉类、鸡肉、肝脏、火腿、冷切肉、奶酪、水果、卷心菜、胡萝卜、西红柿、辣椒、沙拉、柑橘类水果和甜瓜的相关系数值在0.50至0.65之间；而一些很少食用的食物的相关系数值低于0.50。对于所有食物，第二次访谈中估计的每周平均摄入量随着首次访谈三分位数的增加而持续且大幅增加。本研究表明，在家中接受访谈的受试者的饮食信息与他们最初在医院访谈时提供的信息具有令人满意的可比性，并且在两种环境中收集的信息具有良好的可重复性。
