Jorm A F, Jacomb P A
NH & MRC Social Psychiatry Research Unit, Australian National University, Canberra.
Psychol Med. 1989 Nov;19(4):1015-22. doi: 10.1017/s0033291700005742.
The IQCODE is a questionnaire which asks an informant about changes in an elderly person's everyday cognitive function. The questionnaire aims to assess cognitive decline independent of pre-morbid ability. In the present study, the IQCODE was administered to a sample of 613 informants from the general population. In addition, the questionnaire was administered to informants of 309 dementing subjects who had filled it out one year previously. A principal components analysis, using the general population sample, confirmed that the IQCODE measures a general factor of cognitive decline. The questionnaire was found to have high internal reliability in the general population sample (alpha = 0.95) and reasonably high test-retest reliability over one year in the dementing sample (r = 0.75). The total IQCODE score, as well as each of the 26-items, was found to discriminate well between the general population and dementing samples. The correlation with education was quite small (r = -0.13), indicating that contamination by premorbid ability is not a problem.
IQCODE是一份问卷，它向一名信息提供者询问一位老年人日常认知功能的变化情况。该问卷旨在独立于病前能力来评估认知衰退。在本研究中，IQCODE被应用于来自普通人群的613名信息提供者样本。此外，该问卷还被应用于309名痴呆患者的信息提供者，这些患者一年前已填写过该问卷。使用普通人群样本进行的主成分分析证实，IQCODE测量的是认知衰退的一个一般因素。在普通人群样本中，该问卷具有较高的内部信度（α = 0.95），在痴呆样本中，经过一年时间该问卷具有相当高的重测信度（r = 0.75）。IQCODE总分以及26个项目中的每一项，在普通人群和痴呆样本之间都具有良好的区分度。与教育程度的相关性相当小（r = -0.13），这表明病前能力的干扰不是一个问题。
