School of Humanities and Management, Research Center for Quality of Life and Applied Psychology, Key Laboratory for Quality of Life and Psychological Assessment and Intervention, Guangdong Medical University, Dongguan, 523808, China.
School of Nursing, The University of Hong Kong, Hong Kong, China.
BMC Med Res Methodol. 2022 Nov 8;22(1):289. doi: 10.1186/s12874-022-01766-8.
A short instrument would enhance the viability of a study. Therefore, we aimed to shorten the specific module (SPD-10) of the Quality of Life Instrument for Chronic Diseases - Chronic Renal Failure (QLICD-CRF) for assessing the quality of life of patients with chronic renal failure.
The 10-item SPD-10 was self-administered to 164 patients with chronic renal failure. A shortened form was first obtained by a tandem use of the classical test theory (CTT), the generalizability theory (GT), and the item response theory (IRT). In addition, we also shortened the SPD-10 by the Optimal Test Assembly (OTA).
Both the tandem use of GT, CTT and IRT, and the OTA derived the same 7-item shortened version (SPD-7). It included items CRF1, CRF2, CRF3, CRF4, CRF6, CRF8, and CRF9 of the SPD-10. The SPD-7 had a Cronbach alpha of 0.78. The correlation coefficients of its total and factor scores with those of the SPD-10 were 0.96 and 0.98, respectively. Confirmatory factor analysis confirmed the unidimensional structure of the SPD-7, with the comparative fit index=0.96, the Tucker-Lewis index=0.94, and the root mean square error of approximation=0.09.
The short-form SPD-7 is reliable and valid for assessing the impact of clinical symptoms and side effects on the quality of life of patients with chronic renal failure. It is an efficient option without compromising the measurement performance of the SPD-10.
一个简短的工具将提高研究的可行性。因此，我们旨在缩短特定模块（SPD-10）的慢性肾脏病生存质量测定量表-慢性肾衰竭（QLICD-CRF），以评估慢性肾衰竭患者的生活质量。
164 例慢性肾衰竭患者采用 10 项 SPD-10 进行自我评估。首先通过经典测试理论（CTT）、广义理论（GT）和项目反应理论（IRT）的串联使用获得简化形式。此外，我们还通过最佳测试组装（OTA）缩短 SPD-10。
GT、CTT 和 IRT 的串联使用以及 OTA 都得到了相同的 7 项简化版本（SPD-7）。它包括 SPD-10 的 CRF1、CRF2、CRF3、CRF4、CRF6、CRF8 和 CRF9 项。SPD-7 的 Cronbach α 为 0.78。其总分和因子分数与 SPD-10 的相关系数分别为 0.96 和 0.98。验证性因子分析证实了 SPD-7 的单维结构，比较拟合指数=0.96，塔克-刘易斯指数=0.94，近似均方根误差=0.09。
短式 SPD-7 可靠且有效，可评估临床症状和副作用对慢性肾衰竭患者生活质量的影响。它是一种有效的选择，在不影响 SPD-10 测量性能的情况下提高了效率。
