Our Lady's Hospice and Care Services, Harold's Cross, Dublin, Ireland.
J Rehabil Med. 2011 Sep;43(9):808-11. doi: 10.2340/16501977-0860.
To determine test-retest and inter-rater reliability of hand-held dynamometry when used to measure knee--extensor strength in patients with advanced cancer.
Adults with metastatic or locally advanced cancer recruited from palliative care services to a study of the risk factors for falls.
Consecutive recruits (n = 30) underwent repeat testing after an interval of 1 h, by the same researcher, to assess test-retest reliability. The subsequent 15 patients underwent retesting by a second researcher. The intra-class correlation coefficient and limits of agreement were calculated.
The test-retest reliability difference between measurements increased with the magnitude of measurement, mean leg strength = 113 N (standard deviation 43.1), 95% ratio limits of agreement 0.81-1.5, intra-class correlation coefficient = 0.9. The inter-rater testing mean leg strength = 128.5 N (standard deviation 35.1), 95% limits of agreement = -57.24 to 36.06 N. Intra-class correlation coefficient = 0.83.
Test-retesting and inter-rater testing yielded high intra-class correlation coefficients, but the limits of agreement were wide. In test-retesting, the difference between tests increased as the magnitude of measurement increased. It has been widely reported that hand-held dynamometry is reliable when used to measure knee-extensor strength in frail or elderly persons. However, our results show that, even in these populations, reliability may be compromised by inadequate tester strength.
确定手持式测力计在测量晚期癌症患者膝关节伸肌力量时的重测信度和组内信度。
从姑息治疗服务中招募的患有转移性或局部晚期癌症的成年人，以研究跌倒的危险因素。
连续招募的（n=30）在 1 小时的间隔后由同一位研究人员进行重复测试，以评估重测信度。随后的 15 名患者由第二位研究人员进行了重新测试。计算了组内相关系数和界限协议。
测量值之间的重测可靠性差异随测量值的大小而增加，平均腿部力量为 113 N（标准差为 43.1），95%比值界限协议为 0.81-1.5，组内相关系数为 0.9。组内测试平均腿部力量为 128.5 N（标准差为 35.1），95%界限协议为-57.24 至 36.06 N。组内相关系数为 0.83。
重测和组内测试产生了较高的组内相关系数，但界限协议较宽。在重测中，测试之间的差异随着测量值的增加而增加。广泛报道称，手持式测力计在测量虚弱或老年人的膝关节伸肌力量时具有可靠性。然而，我们的结果表明，即使在这些人群中，可靠性也可能因测试者力量不足而受到影响。
