Ademiluyi Adekunle Z, van Asselt Antoinette D I, Reneman Michiel F
University of Groningen, Groningen, The Netherlands.
Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
Eur J Health Econ. 2025 Feb 21. doi: 10.1007/s10198-025-01756-9.
The iMTA productivity cost questionnaire (iPCQ) has been recommended as a measurement tool for productivity cost, however, its use in routine care is hindered by the length of this questionnaire (18 questions). This study developed and tested a short-form (SF-) iPCQ.
A secondary analysis of the Groningen Spine Cohort's baseline data from patients with low back pain referred for tertiary care was performed. Six SFs were evaluated against the comprehensive iPCQ. Spearman correlation (r), intraclass correlation coefficient (ICC, agreement), standard error of measurement (SEM), and Bland-Altman's plot tested the congruence of the SFs with the comprehensive iPCQ.
The sample consisted of 1220 patients with low back pain. The SF version with the highest correlation (SF-3; 7 items) with the comprehensive iPCQ had r = 0.99, ICC = 0.99, SEM = 295, while the SF with the least number of items (SF-6; 5 items) had r = 0.84, ICC = 0.91, SEM = 2063. The mean productivity cost estimates of SF-3 and SF-6 were €3414 (95% CI: 3036-3791) and €3333 (95% CI: 2970-3696) respectively while that for the comprehensive iPCQ amounted to €3456 (95% CI: 3189-3720).
A SF with seven questions was developed with a high agreement with the comprehensive iPCQ. Initial clinimetric testing was satisfactory. Further assessment is recommended.
iMTA生产力成本问卷（iPCQ）已被推荐作为生产力成本的测量工具，然而，该问卷的长度（18个问题）阻碍了其在常规护理中的使用。本研究开发并测试了简版（SF-）iPCQ。
对格罗宁根脊柱队列中因腰痛转诊至三级护理的患者的基线数据进行二次分析。将六个简版与完整的iPCQ进行评估。采用Spearman相关性（r）、组内相关系数（ICC，一致性）、测量标准误差（SEM）以及Bland-Altman图来测试简版与完整iPCQ的一致性。
样本包括1220例腰痛患者。与完整iPCQ相关性最高的简版（SF-3；7个问题）的r = 0.99，ICC = 0.99，SEM = 295，而问题数量最少的简版（SF-6；5个问题）的r = 0.84，ICC = 0.91，SEM = 2063。SF-3和SF-6的平均生产力成本估计分别为3414欧元（95%CI：3036 - 3791）和3333欧元（95%CI：2970 - 3696），而完整iPCQ的平均生产力成本估计为3456欧元（95%CI：3189 - 3720）。
开发了一个包含七个问题的简版，与完整iPCQ具有高度一致性。初步的临床测量学测试结果令人满意。建议进一步评估。
