Psychometric Properties of the Psychological Factors of Deseases Related Work Inventory: A Study with Workers of the Meat Processing Industry

Abstract This study assesses the psychometric properties of the Inventory of Psychological Factors in Work-Related Illnesses (IP-T), based on the following indicators: criterion validity, construct validity, and reliability. The sample consisted of 355 workers in the meatpacking industry of pork, poultry and other small animals in the west of the state of Paraná. The Self-Reporting Questionnaire (SRQ-20) and the Hospital Anxiety and Depression Scale (HADS) were also used. All sub-scales of the IP-T proved positive predictors of sick leave due to occupational disease, with moderate sensitivity and specificity. The correlation matrix between the scales was uniform, with coefficients between 0.80 and 0.91, suggesting convergence between the subscales of the IP-T and other scales, but indicating a weak discriminative power. The reliability indices of the sub-scales of the IP-T proved satisfactory: between 0.95 (Anxiety IP-T) and 0.78 (Social Abilities).

摘要 本研究基于效标效度、结构效度与信度三类指标，评估工作相关疾病心理因素量表（Inventory of Psychological Factors in Work-Related Illnesses，IP-T）的心理测量学特征。研究样本为巴拉那州（Paraná）西部猪肉、家禽及其他小型动物肉类加工行业的355名劳动者。本研究同时采用了自我报告问卷（Self-Reporting Questionnaire，SRQ-20）与医院焦虑抑郁量表（Hospital Anxiety and Depression Scale，HADS）。IP-T的所有分量表均可作为职业疾病所致病假的正向预测因子，且具备中等水平的灵敏度与特异度。各量表间的相关矩阵呈现一致性特征，相关系数介于0.80至0.91之间，表明IP-T各分量表与其他量表间存在聚合性，但同时提示其区分能力较弱。IP-T各分量表的信度指标均表现良好，信度系数介于0.78（社会能力分量表，Social Abilities）与0.95（焦虑分量表，Anxiety IP-T）之间。