Wiederien Robert C, Wang Dan, Frey-Law Laura A
Department of Physical Therapy and Rehabilitation Science, Carver College of Medicine, University of Iowa, Iowa City, IA, United States.
Front Pain Res (Lausanne). 2024 Aug 5;5:1415635. doi: 10.3389/fpain.2024.1415635. eCollection 2024.
While numeric scales to represent pain intensity have been well validated, individuals use various conceptualizations when assigning a number to pain intensity, referred to as pain rating schema. The 18-item Pain Schema Inventory (PSI-18) quantifies pain rating schema by asking for numeric values for multiple mild, moderate or severe pain conditions. This study aimed to assess the validity and reliability of a shortened form of the PSI, using only 6 items (PSI-6).
A secondary analysis was performed on two existing datasets. The first ( = 641) involved a community-based population that completed the PSI-18. The second ( = 182) included participants with chronic pain who completed the PSI-6 twice, one week apart. We assessed face validity, convergent validity, offset biases, test-retest reliability, and internal consistency of the PSI-6 compared to the PSI-18.
Both the PSI-18 and PSI-6 demonstrated excellent face validity. The PSI-6 demonstrated excellent convergent validity relative to the PSI-18, with correlations from r = 0.88 to 0.92. Bland-Altman plots revealed offset biases near zero (< 0.22 on 0-10 scale) across all categories of mild, moderate, severe and average pain. Internal consistency was excellent, with Cronbach's Alpha = 0.91 and 0.80, for PSI-18 and PSI-6 respectively. Test-retest reliability of the PSI-6 was high with correlations from r = 0.70-0.76.
The PSI-6 is a valid and reliable tool to assess pain rating schema with reduced subject burden, to better interpret individuals' pain ratings and adjust for inter-individual variability.
虽然用于表示疼痛强度的数字量表已得到充分验证，但个体在为疼痛强度赋值时会采用各种概念化方式，即疼痛评分模式。18项疼痛模式量表（PSI - 18）通过询问多种轻度、中度或重度疼痛状况的数值来量化疼痛评分模式。本研究旨在评估仅使用6项内容的PSI简化版（PSI - 6）的有效性和可靠性。
对两个现有数据集进行二次分析。第一个数据集（n = 641）涉及一个完成了PSI - 18的社区人群。第二个数据集（n = 182）包括慢性疼痛患者，他们在相隔一周的时间里两次完成了PSI - 6。我们评估了PSI - 6相对于PSI - 18的表面效度、收敛效度、偏差、重测信度和内部一致性。
PSI - 18和PSI - 6均表现出出色的表面效度。相对于PSI - 18，PSI - 6表现出出色的收敛效度，相关性从r = 0.88至0.92。布兰德 - 奥特曼图显示，在轻度、中度、重度和平均疼痛的所有类别中，偏差接近零（在0 - 10量表上<0.22）。内部一致性良好，PSI - 18和PSI - 6的克朗巴哈系数分别为0.91和0.80。PSI - 6的重测信度较高，相关性从r = 0.70 - 0.76。
PSI - 6是一种有效且可靠的工具，可用于评估疼痛评分模式，同时减轻受试者负担，以便更好地解释个体的疼痛评分并调整个体间差异。
