Background: Cognitive difficulties are a core deficit for people with schizophrenia and are generally assessed with neuropsychological tests. Self-report assessments are also useful in understanding difficulties from the service user's perspective. This study aims to introduce and test the shorter version of the Subjective Scale to Investigate Cognition in Schizophrenia (SSTICS) to improve its acceptability and comprehensibility.Methods: In consultation with service users and clinicians, we identified items from the original 21-item SSTICS that were found difficult and these were excluded. The reduced scale was explored with Confirmatory Factor Analysis (CFA) in two independent samples in the UK and Canada. Convergent validity with symptoms and IQ was assessed and compared between the original and the reduced scale.Results: Six-hundred and seven people with schizophrenia and first-episode psychosis took part in this study. Seven items were removed to produce the SSTICS-Brief. This had good reliability and the CFA confirmed a unidimensional structure. Convergent validity with symptoms and IQ were optimal between the long and short versions.Conclusions: The SSTICS-B has better acceptability than its longer form and could be administered in less time. The resulting measure is likely to be a valuable short self-assessment of cognitive complaints for people with schizophrenia.

中文翻译：

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研究精神病患者的主观认知障碍：介绍对精神分裂症的认知研究的简要量表（SSTICS-Brief）。

背景：认知障碍是精神分裂症患者的核心缺陷，通常通过神经心理学测试进行评估。自我报告评估对于从服务用户的角度理解困难也很有用。这项研究旨在引入和测试主观量表以调查精神分裂症认知（SSTICS）的较短版本，以提高其可接受性和可理解性。方法：与服务使用者和临床医生协商，我们从最初的21个项目的SSTICS中确定了一些项目，被发现困难，这些被排除在外。在英国和加拿大的两个独立样本中，通过验证性因子分析（CFA）探索了减少的规模。评估症状和智商的收敛效度，并比较原始量表和缩减量表的结果。607名精神分裂症和首发精神病患者参加了这项研究。删除了七个项目以生成SSTICS-Brief。这具有良好的可靠性，CFA确认为一维结构。长版和短版在症状和智商方面的收敛效度最佳。结论：SSTICS-B的可接受性高于较长形式，可以在更短的时间内给药。对于精神分裂症患者而言，由此产生的测量结果可能是有价值的简短的认知障碍自我评估。结论：SSTICS-B与更长的形式相比具有更好的可接受性，并且可以在更短的时间内施用。对于精神分裂症患者而言，由此产生的测量结果可能是有价值的简短的认知障碍自我评估。结论：SSTICS-B与更长的形式相比具有更好的可接受性，并且可以在更短的时间内施用。对于精神分裂症患者而言，由此产生的测量结果可能是有价值的简短的认知障碍自我评估。