基于概化理论的胃癌生命质量测定量表QLICP-GA的信度分析

Reliability analysis of quality of life instruments for cancer patients-gastric cancer (QLICP-GA) based on generalizability theory

目的:应用概化理论评价癌症患者生命质量测定量表体系之胃癌量表(quality of life instruments for cancer patients-gastric cancer,QLICP-GA)的信度,为量表的修订及改进提供参考。方法:利用SPSS软件中GeneralLinearModel菜单的UNIANOVA模块计算出受试者、条目及两者交互作用的均方,进而计算概化系数和可靠性指数以评价QLICP-GA的信度。结果:G研究中,每个领域被试与条目的交互作用均是主要的变异来源,由被试解释的变异较大,由条目解释的变异最小。D研究中,5个领域的概化系数分别为躯体领域0.774、心理领域0.854、社会领域0.670、共性症状及不良反应领域0.717、特异模块0.696。结论:QLICP-GA中躯体领域、心理领域及共性症状和不良反应领域的信度较好,社会领域和特异模块的信度尚可。将来对量表进行修改时社会领域是重点,可考虑将其条目数由6个增加为8个或10个。其次,特异模块的条目数也可适当增加,可由7个增加至9个。

Objective： To evaluate the reliability of QLICP-GA （quality of life instruments for cancer patients-gastric cancer） scale by using generalizability theory, and to provide the references in order to revise and improve this scale. Methods： The mean squares of person （p）, item （i） and the person-by- item interaction effect （pi） were calculated by using the module of UNIANOVA under the menu of General Linear Model in SPSS software. Furthermore, the generalizability coefficients and indexes of dependability were calculated in order to assess the reliability of QLICP-GA scale. Results： The largest source of variation in every domain was due to person-by-item interaction. The variances accounted for by person were large, while the variation accounted for by item was minimal. Generalizability coefficients of five domains were 0.774 （physical domain）, 0.854 （psychological domain）, 0.670 （social domain）, 0.717 （common symptom and side effect domain）, and 0.696 （specific domain）, respectively. Conclusion： Physical domain, psychological domain and common symptom and side effect domain in QLICP-GA have good reliability. However, social domain and specific domain have acceptable reliability. Social domain should be emphasized when this scale will be revised and improved in future. The number of items of social domain should be added from 6 to 8 or 10. Secondly, the number of items of specific domain may beslightly added from 7 to 9.