Department of Rehabilitation Medicine, Faculty of Medicine, Chiang Mai University, 50200, Chiang Mai, Thailand.
Department of Psychiatry, Faculty of Medicine, Chiang Mai, 50200, Chiang Mai, Thailand.
BMC Med Res Methodol. 2021 Mar 9;21(1):46. doi: 10.1186/s12874-021-01238-5.
This study investigated the ArmA-TH sub-scale measurement properties based on item response theory using the Rasch model.
Patients with upper limb hemiplegia resulting from cerebrovascular and other brain disorders were asked to complete the ArmA-TH questionnaire. Rasch analysis was performed to test how well the ArmA-TH passive and active function sub-scales fit the Rasch model by investigating unidimensionality, response category functioning, reliability of person and item, and differential item functioning (DIF) for age, sex, and education.
Participants had stroke or other acquired brain injury (n = 185), and the majority were men (126, 68.1 %), with a mean age of 55 (SD 22). Most patients (91, 49.2 %) had graduated from elementary/primary school. For the ArmA-TH passive function scale, all items had acceptable fit statistics. The scale's unidimensionality and local independence were supported. The reliability was acceptable. A disordered threshold was found for five items, and none indicated DIF. For the ArmA-TH active function scale, one item was misfit and three were locally dependent. The reliability was good. No items showed DIF. All items had disordered thresholds, and the data fitted the Rasch model better after rescoring.
Both sub-scales of ArmA-TH fitted the Rasch model and were valid and reliable. The disordered thresholds should be further investigated.
本研究采用 Rasch 模型，基于项目反应理论，调查了 ArmA-TH 亚量表的测量特性。
上肢偏瘫患者（由脑血管病及其他脑疾病引起）完成 ArmA-TH 问卷。通过考察单维性、反应类别功能、个体和项目的可靠性以及年龄、性别和教育的差异项目功能（DIF），对 ArmA-TH 被动和主动功能子量表进行 Rasch 分析，以检验其对 Rasch 模型的拟合程度。
参与者有卒中或其他获得性脑损伤（n=185），其中大多数为男性（126，68.1%），平均年龄为 55（SD 22）岁。大多数患者（91，49.2%）毕业于小学/初中。对于 ArmA-TH 被动功能量表，所有项目的拟合统计数据均在可接受范围内。该量表的单维性和局部独立性得到支持。可靠性可接受。发现 5 个项目的阈值紊乱，无项目存在 DIF。对于 ArmA-TH 主动功能量表，1 个项目拟合不良，3 个项目局部依赖。可靠性良好。无项目存在 DIF。所有项目的阈值都紊乱，重新评分后数据更符合 Rasch 模型。
ArmA-TH 的两个亚量表均符合 Rasch 模型，具有有效性和可靠性。应进一步研究紊乱阈值。
