Van 't Hof M A, Hautvast J G, Schroll M, Vlachonikolis I G
Eur J Clin Nutr. 1991 Dec;45 Suppl 3:5-22.
At the initiative of EC/Euronut a European Community project (SENECA) began in 1988, with 19 research groups working on the major nutritional issues affecting the growing number of elderly people in Europe. Some 2600 people born between 1913 and 1918 were studied, using strictly standardized methodology. Data have been collected on the dietary intake of these people, their nutritional status, physical activity, life-style, health and performance. It is envisaged that the SENECA project will be continued according to a mixed longitudinal design. The mean response rate in a group of 18 communities in which a non-participation study was conducted was 51%, while 60% of the non-responders were prepared to complete a non-responders' questionnaire. On the basis of the data collected from both responders and non-responders, it was found that males, non-smokers, healthy and better educated persons participated better in the SENECA study than females, smokers, persons who judged their health to be poor, and persons with comparatively poor education, respectively. Housing (having a garden), age, and marital state (single) were only of minor importance for the participation. Persons who did not eat a cooked meal daily, generally participated less, but this differed between towns. It is demonstrated how stratum-specific weighting factors can be calculated to partially remove bias due to selectivity in participation.
在欧共体/欧洲营养问题研究组的倡导下，1988年启动了一个欧洲共同体项目（SENECA），有19个研究小组致力于研究影响欧洲日益增多的老年人的主要营养问题。对大约2600名出生于1913年至1918年之间的人进行了研究，采用了严格标准化的方法。收集了这些人的饮食摄入量、营养状况、身体活动、生活方式、健康状况和表现等方面的数据。预计SENECA项目将按照混合纵向设计继续进行。在一组进行了无应答研究的18个社区中，平均应答率为51%，而60%的无应答者愿意填写无应答者问卷。根据从应答者和无应答者收集的数据发现，男性、非吸烟者、健康者和受过良好教育者比女性、吸烟者、自认为健康状况差的人以及教育程度相对较低的人分别更愿意参与SENECA研究。住房情况（有花园）、年龄和婚姻状况（单身）对参与度的影响较小。不每天吃熟食的人通常参与度较低，但不同城镇之间存在差异。展示了如何计算特定阶层的加权因子以部分消除因参与选择性导致的偏差。
