Third Department of Psychiatry, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.
Ann Gen Psychiatry. 2011 Apr 11;10(1):13. doi: 10.1186/1744-859X-10-13.
The 'double-diamond copy' task is a simple paper and pencil test part of the Bender-Gestalt Test and the Mini Mental State Examination (MMSE). Although it is a widely used test, its method of scoring is crude and its psychometric properties are not adequately known. The aim of the present study was to develop a sensitive and reliable method of administration and scoring.
The study sample included 93 normal control subjects (53 women and 40 men) aged 35.87 ± 12.62 and 127 patients suffering from schizophrenia (54 women and 73 men) aged 34.07 ± 9.83.
The scoring method was based on the frequencies of responses of healthy controls and proved to be relatively reliable with Cronbach's α equal to 0.61, test-retest correlation coefficient equal to 0.41 and inter-rater reliability equal to 0.52. The factor analysis produced two indices and six subscales of the Standardised Copy of Pentagons Test (SCPT). The total score as well as most of the individual items and subscales distinguished between controls and patients. The discriminant function correctly classified 63.44% of controls and 75.59% of patients.
The SCPT seems to be a satisfactory, reliable and valid instrument, which is easy to administer, suitable for use in non-organic psychiatric patients and demands minimal time. Further research is necessary to test its psychometric properties and its usefulness and applications as a neuropsychological test.
“双菱形复制”任务是 Bender-Gestalt 测验和 Mini 精神状态检查（MMSE）的简单纸笔测试部分。尽管它是一种广泛使用的测试，但它的评分方法很粗糙，其心理测量特性也不清楚。本研究的目的是开发一种敏感和可靠的管理和评分方法。
研究样本包括 93 名正常对照组（53 名女性和 40 名男性），年龄为 35.87±12.62 岁；127 名患有精神分裂症的患者（54 名女性和 73 名男性），年龄为 34.07±9.83 岁。
评分方法基于健康对照者的反应频率，证明相对可靠，Cronbach's α 为 0.61，重测信度系数为 0.41，评分者间信度为 0.52。因子分析产生了两个标准五边形复制测试（SCPT）指数和六个分量表。总分以及大多数单项和分量表都能区分对照组和患者组。判别函数正确地将 63.44%的对照组和 75.59%的患者进行了分类。
SCPT 似乎是一种令人满意的、可靠的和有效的工具，易于管理，适用于非器质性精神病患者，且需要的时间最少。需要进一步的研究来测试其心理测量特性及其作为神经心理测试的有用性和适用性。
