回报可能性指数量表中文版应用于阿片类物质成瘾患者的信效度

目的评价中文版回报可能性指数量表(reward probability index,RPI)在阿片类物质成瘾治疗患者中的信度和效度。方法在武汉市美沙酮维持治疗(methadone maintenance treatment,MMT)门诊随机招募接受治疗的160例阿片类物质成瘾患者,使用中文版RPI量表进行调查,IBM SPSS22.0进行条目分析和探索性因子分析,AMOS 24.0进行验证性因子分析(CFA)。结果中文版RPI量表各条目与量表总分的相关度为0.325~0.657(均P<0.01),量表具有较好的项目区分度;探索性因子分析抽取了正向回报和环境抑制2个因子,各条目在所属因子上的负荷为0.519~0.744;验证性因子分析的拟合指标为χ^2/df=1.623,RMR=0.030,RMSEA=0.063,IFI=0.902,TLI=0.885,CFI=0.900。量表的内部一致性Cronbach’sα信度系数为0.800。各维度及总量表均不存在天花板/地板效应。结论中文版RPI量表维度划分基本合理,该量表作为评价阿片类物质成瘾者从环境中获取回报能力的测量工具具有较好的信度和效度。

The reliability and validity of Reward Probability Index-Chinese version applied among individuals with opioid dependence

Objective To evaluate the reliability and validity of the Reward Probability Index-Chinese version(C-RPI)among individuals with opioid dependence.Methods A total of 160 individuals with opioid dependence were recruited from the methadone maintenance treatment(MMT)programs in Wuhan.The C-RPI was used in the investigation,and items/exploratory factors and confirmatory factors were adopted to analyze with IBM SPSS 22.0 and AMOS 24.0,respectively.Results The correlation between each item and the total score of the scale was 0.325-0.657(all P<0.01)and the item discrimination of the scale was good.Exploratory factor analysis extracted two factors,including reward probability and environmental suppressors,and a load of each item on its factor ranged from 0.519 to 0.744.The fitting indexes of confirmatory factor analysis were as follows:χ^2/df=1.623,RMR=0.030,RMSEA=0.063,IFI=0.902,TLI=0.885,CFI=0.900.The internal consistency coefficient(Cronbach'sα)of the C-RPI was 0.800;and there was no ceiling/floor effect on each dimension and total scale.Conclusion The classification of dimensions for the C-RPI is reasonable,and the scale has good reliability and validity to measure the ability to obtain environmental rewards for individuals with opioid dependence.