Simancas-Pallares Miguel, Arrieta Katherine Margarita, Arévalo Luisa Leonor
Departamento de Investigación, Facultad de Odontología, Universidad de Cartagena, Cartagena de Indias, Colombia.
Biomedica. 2017 Sep 1;37(3):308-314. doi: 10.7705/biomedica.v37i3.3240.
The analysis of the psychometric properties of an instrument is important for the control of measurement bias.
To compare the construct validity and internal consistency of three factorial structures of the General Health Questionnaire-12.
We conducted a validation study in a nested sample of 483 dentistry students from Cartagena, Colombia. The instrument was applied along with questions about personal factors. The construct validity of the following structures was evaluated: one-dimensional, one-dimensional with correction of response bias, and the two and three-factor structure, and these scoring systems: Likert scale (0-1-2-3) and dichotomous (0-0-1-1) scoring method. Validity was determined by confirmatory factorial analysis, and the internal consistency with Cronbach's alpha coefficient for the Likert scale and the Kuder-Richardson Formula 20 for the dichotomous scoring using the Stata™, v. 13.2 (Stata Corp, USA) and Mplus™, v.7.11 (Muthen and Muthen, USA) software.
Adjustment indexes revealed that the best model was the one-dimensional one with correction of response bias based on a dichotomous scoring (degrees of freedom=36; chi square=52.432; root mean square error of approximation=0.03; 90% CI: 0.008-0.048; comparative fit index=0.982; Tucker-Lewis index=0.966). The internal consistency was 0.70.
The adjustment of the model in this study allowed for the control of measurement bias and guaranteed external validity of results when using the General Health Questionnaire-12 to evaluate mental conditions in this population. The psychometric properties of the scales should be critically evaluated before results analysis.
对一种工具的心理测量特性进行分析对于控制测量偏差很重要。
比较一般健康问卷12的三种因子结构的结构效度和内部一致性。
我们在来自哥伦比亚卡塔赫纳的483名牙科专业学生的嵌套样本中进行了一项验证研究。该工具与关于个人因素的问题一起使用。评估了以下结构的结构效度：一维结构、校正反应偏差后的一维结构、二因素和三因素结构，以及这些计分系统：李克特量表（0 - 1 - 2 - 3）和二分法（0 - 0 - 1 - 1）计分方法。通过验证性因子分析确定效度，并使用Stata™ v. 13.2（美国Stata公司）和Mplus™ v.7.11（美国Muthen和Muthen公司）软件，用李克特量表的克朗巴赫α系数和二分法计分的库德 - 理查森公式20确定内部一致性。
调整指标显示，最佳模型是基于二分法计分且校正反应偏差的一维模型（自由度 = 36；卡方 = 52.432；近似均方根误差 = 0.03；90%置信区间：0.008 - 0.048；比较拟合指数 = 0.982；塔克 - 刘易斯指数 = 0.966）。内部一致性为0.70。
本研究中模型的调整允许控制测量偏差，并在使用一般健康问卷12评估该人群的心理状况时保证结果的外部效度。在结果分析之前，应对量表的心理测量特性进行严格评估。
