van den Beld Willeke A, van der Sanden Gitty A C, Sengers Rob C A, Verbeek André L M, Gabreëls Fons J M
Department of Rehabilitation Medicine (HP 898), University Medical Centre Nijmegen St Radboud, PO Box 9101, 6500 HB Nijmegen, The Netherlands.
Disabil Rehabil. 2006 Nov 15;28(21):1303-9. doi: 10.1080/09638280600631047.
Validity and reproducibility of the Jamar dynamometer were evaluated in children aged 4-11 years.
Hand grip strength was measured on the dominant side and non-dominant side in 67 patients who had been referred to our specialist centre in the past 3 years because of suspected myopathy. All the patients had had muscle biopsy. Sixteen out of the 67 patients proved to have myopathy, while 51 had no myopathy. The investigator was blinded against the true diagnosis and clinical course of the patients at the time of testing. Validity was assessed by the power to discriminate between patients with and without myopathy, using logistic regression analysis and receiver operating characteristic (ROC) analysis. The area under the ROC curve (AUC) was calculated as a measure of the discriminative power. Sensitivity (Se) and specificity (Sp) were assessed at a specifically chosen cut-off point. Reproducibility was assessed by evaluating the test-retest reliability in a stratified random sample of 40 patients who returned for remeasurements, using the intraclass correlation coefficient (ICC).
AUCs ranged from 0.78 - 0.82. At an Se = 81% cut-off point, Sp varied from 67-73%. ICCs ranged from 0.91-0.93.
The Jamar dynamometer had discriminative power in children with suspected myopathy. Reproducibility was high. The Jamar dynamometer was a good, but not completely accurate, test for myopathy.
评估Jamar握力计在4至11岁儿童中的有效性和可重复性。
对过去3年因疑似肌病转诊至我们专科中心的67例患者的优势侧和非优势侧进行握力测量。所有患者均进行了肌肉活检。67例患者中有16例被证实患有肌病，51例无肌病。测试时，研究者对患者的真实诊断和临床病程不知情。通过逻辑回归分析和受试者工作特征（ROC）分析，以区分有肌病和无肌病患者的能力来评估有效性。计算ROC曲线下面积（AUC）作为判别能力的指标。在特定选择的临界点评估敏感性（Se）和特异性（Sp）。通过使用组内相关系数（ICC）评估40例返回重新测量的分层随机样本患者的重测信度来评估可重复性。
AUC范围为0.78 - 0.82。在Se = 81%的临界点，Sp在67% - 73%之间变化。ICC范围为0.91 - 0.93。
Jamar握力计对疑似肌病儿童具有判别能力。可重复性高。Jamar握力计是一种用于肌病的良好但并非完全准确的测试。
