基于经典测量理论与项目反应理论的慢性肺源性心脏病生命质量测定量表QLICD-CPHD(V2.0)条目分析

Item Analysis on Quality of Life Instruments for Chronic Pulmonary Heart Disease QLICD-CPHD(V2.0)based on Classical Test Theory and Item Response Theory

目的应用经典测量理论(classical test theory,CTT)和项目反应理论(item response theory,IRT)对慢性肺源性心脏病生命质量测定量表[QLICD-CPHD(V2.0)]进行条目分析与评价。方法采用QLICD-CPHD(V2.0)量表对184名慢性肺源性心脏病患者进行调查,运用经典测量理论中的相关系数法、变异度法、因子分析法、克朗巴赫系数法对QLICD-CPHD(V2.0)量表的条目进行分析评定,同时运用项目反应理论中的Samejima等级反应模型计算量表每个条目的难度、信息量和区分度系数。结果CTT结果提示存在7个条目不满足至少3种的统计学要求,其中共性模块6个,特异模块1个。IRT结果显示条目区分度范围为1.18~1.44较为适宜。难度系数随难度等级(B1→B4)增加而单调递增,存在部分条目难度系数b超过标准值范围。各条目平均信息量分布在0.185~0.576。结论经CTT与IRT分析,QLICD-CPHD(V2.0)量表的大部分条目质量较高,具有较好的区分度,但仍有少量条目需进一步分析和修订。

Objective To analyze and evaluate the items of the QLICD-CPHD(V2.0)scale for chronic pulmonary heart disease using classical test theory(CTT)and item response theory(IRT).Methods 184 patients with chronic pulmonary heart disease were investigated by QLICD-CPHD(V2.0)scale.The items of the QLICD-CPHD(V2.0)scale was evaluated by some statistical methods based on CTT including correlation coefficient method,variance method,factor analysis method and Cronbach′s α coefficient method.Meanwhile,Samejima hierarchical response model of item response theory was utilized to calculate the difficulty,information and differentiation coefficient content of each item in the scale.Results CTT results showed that 7 items failed meet at least three or more statistical requirements,including 6 items in the general module and 1 item in the disease specific module.IRT results showed that the range of item differentiation was 1.18~1.44,which was suitable.The difficulty coefficient increases monotonously with the increase of the difficulty level(B1→B4),and some items exceed the standard value range.The average information amount of each item ranges from 0.185~0.576.Conclusion By CTT and IRT analysis,most items of the QLICD-CPHD(V2.0)scale have good performance and good differentiation,but a few items still need further revision.