Metzner H L, Thompson F E, Lamphiear D E, Oh M S, Hawthorne V M
Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor 48109.
Nutr Cancer. 1988;11(1):61-71. doi: 10.1080/01635588809513970.
As part of an effort to assess the most reliable method of obtaining information about long-term dietary intake, a study was conducted of the correspondence between perception of change in diet and measured change in reported diet from 1967 to 1982. Respondents were 1,201 men and women participants in the Tecumseh Food Frequency Study of 1967-1969 who were 45-64 years of age in 1982-1983, the time of the Diet Methodology Study. Perceptions of change were obtained by asking respondents directly if they thought they currently ate each of 12 food groups more often, less often, or as often as they did during the year of their earlier interview. Measured change was obtained by subtracting each respondent's baseline frequency for each of the 12 food groups from his or her current frequency. For 10 of the 12 food groups, correspondence was found between perception of change and measured change; fats and oils added at the table and meat were the exceptions. Significant linear relationships were found between perceptions and measured change for all food groups except fats and oils. However, greatly varying coefficients were associated with terms such as more often or as often as before, thereby limiting the potential utility of combining perceptions of change with current frequencies to obtain a reliable measure of baseline frequencies.
作为评估获取长期饮食摄入信息最可靠方法的一项工作的一部分，开展了一项关于1967年至1982年饮食变化认知与报告饮食的实测变化之间对应关系的研究。受访者是1967 - 1969年参加蒂卡姆西食物频率研究的1201名男性和女性参与者，在1982 - 1983年（即饮食方法学研究之时）年龄为45 - 64岁。通过直接询问受访者他们认为自己目前食用12种食物组中的每一种的频率是比早期访谈年份更频繁、更不频繁还是与当时一样，来获取变化认知。实测变化是通过用每位受访者当前12种食物组中每种的频率减去其基线频率来获得的。在12种食物组中的10种中，发现变化认知与实测变化之间存在对应关系；例外的是餐桌上添加的油脂和肉类。除油脂外，所有食物组的认知与实测变化之间都发现了显著的线性关系。然而，与“比以前更频繁”或“与以前一样频繁”等表述相关的系数差异很大，从而限制了将变化认知与当前频率相结合以获得可靠基线频率测量值的潜在效用。
