Department of Quality Management and Social Medicine, University Medical Center Freiburg, Engelbergerstr. 21, 79106, Freiburg, Germany,
Qual Life Res. 2014 May;23(4):1255-65. doi: 10.1007/s11136-013-0575-6. Epub 2013 Nov 17.
Study aim was to translate the PROMIS(®) pain interference (PI) item bank (41 items) into German, test its psychometric properties in patients with chronic low back pain and develop static subforms.
We surveyed N = 262 patients undergoing rehabilitation who were asked to fill out questionnaires at the beginning and 2 weeks after the end of rehabilitation, applying the Oswestry Disability Index (ODI) and Pain Disability Index (PDI) in addition to the PROMIS(®) PI items. For psychometric testing, a 1-parameter item response theory (IRT) model was used. Exploratory and confirmatory factor analyses as well as reliability and construct validity analyses were conducted.
The assumptions regarding IRT scaling of the translated PROMIS(®) PI item bank as a whole were not confirmed. However, we succeeded in devising three static subforms (PI-G scales: PI mental 13 items, PI functional 11 items, PI physical 4 items), revealing good psychometric properties.
The PI-G scales in their static form can be recommended for use in German-speaking countries. Their strengths versus the ODI and PDI are that pain interference is assessed in a differentiated manner and that several psychometric values are somewhat better than those associated with the ODI and PDI (distribution properties, IRT model fit, reliability). To develop an IRT-scaled item bank of the German translations of the PROMIS(®) PI items, it would be useful to have additional studies (e.g., with larger sample sizes and using a 2-parameter IRT model).
研究目的是将 PROMIS（®）疼痛干扰（PI）项目库（41 项）翻译为德语，在慢性下腰痛患者中测试其心理测量学特性，并开发静态子表。
我们调查了 N = 262 名接受康复治疗的患者，要求他们在康复开始和结束后 2 周填写问卷，除了 PROMIS（®）PI 项目外，还应用 Oswestry 残疾指数（ODI）和疼痛残疾指数（PDI）。对于心理测量测试，使用了 1 个参数项目反应理论（IRT）模型。进行了探索性和验证性因子分析以及可靠性和结构有效性分析。
整个翻译后的 PROMIS（®）PI 项目库的 IRT 定标假设未得到确认。然而，我们成功地设计了三个静态子表（PI-G 量表：PI 心理 13 项、PI 功能 11 项、PI 身体 4 项），显示出良好的心理测量学特性。
PI-G 量表的静态形式可推荐在德语国家使用。与 ODI 和 PDI 相比，其优势在于疼痛干扰以更具区分度的方式进行评估，并且几个心理测量值略优于与 ODI 和 PDI 相关的值（分布特性、IRT 模型拟合、可靠性）。为了开发 PROMIS（®）PI 项目德语翻译的 IRT 定标项目库，进行额外的研究（例如，使用更大的样本量和 2 参数 IRT 模型）将是有用的。
