Keller A, Hellesnes J, Brox J I
Department of Physical Medicine and Rehabilitation, University Hospital Ullevaal, Oslo, Norway.
Spine (Phila Pa 1976). 2001 Apr 1;26(7):771-7. doi: 10.1097/00007632-200104010-00017.
A reliability study was performed.
To determine the intersession reproducibility of the isokinetic trunk extensor strength test, the Biering-Sørensen test, and the Astrand test by calculation of the intraclass correlation coefficient and the critical difference.
Several physical measurements have been used in clinical evaluation of patients with chronic low back pain. Reliability can be evaluated by calculation of either intraclass correlation coefficient or critical difference, but interpretation of the results may vary depending on which method is used.
For this study, 31 patients with chronic low back pain carried out the isokinetic trunk extensor test, the Biering-Sørensen test, and the Astrand test as also did age- and gender-matched healthy individuals. Measurements were performed in three separate sessions at the same time of the day and by the same experienced examiner. The intervals between the sessions were 5 to 10 days.
The isokinetic tests showed a learning effect between Tests 1 and 2. For the isokinetic test, the critical difference increased with increased angular velocities from 28% to 63% in the patients and from 27% to 39% in the healthy subjects. The critical differences for the patients and the healthy individuals were 57% vs 54% for the Biering-Sørensen test and 21% vs 23% for the Astrand test, respectively. The intraclass correlation coefficient ranged from 93% to 98% in the patients and 80%-98% in the healthy individuals.
The reliability was found to be acceptable for the Astrand test and the isokinetic test at 60 degrees per second, as evaluated by the critical difference. All the tests were highly reliable according to the intraclass correlation coefficient, except for Biering-Sørensen test for healthy individuals. The critical difference is the preferable measure because calculation of the intraclass correlation coefficient may give a misleading high estimate of reliability.
进行了一项可靠性研究。
通过计算组内相关系数和临界差异，确定等速躯干伸肌力量测试、比林-索伦森测试和阿斯兰德测试在不同测试阶段的可重复性。
在慢性下腰痛患者的临床评估中使用了多种身体测量方法。可靠性可以通过计算组内相关系数或临界差异来评估，但结果的解释可能因使用的方法而异。
在本研究中，31例慢性下腰痛患者以及年龄和性别匹配的健康个体进行了等速躯干伸肌测试、比林-索伦森测试和阿斯兰德测试。测量在一天中的同一时间由同一位经验丰富的检查者在三个不同的阶段进行。各阶段之间的间隔为5至10天。
等速测试显示在测试1和测试2之间存在学习效应。对于等速测试，临界差异随着角速度的增加而增加，患者组从28%增加到63%，健康受试者组从27%增加到39%。患者和健康个体在比林-索伦森测试中的临界差异分别为57%和54%，在阿斯兰德测试中分别为21%和23%。患者组的组内相关系数范围为93%至98%，健康个体组为80%至98%。
根据临界差异评估，阿斯兰德测试和每秒60度的等速测试的可靠性是可以接受的。根据组内相关系数，所有测试都具有高度可靠性，但健康个体的比林-索伦森测试除外。临界差异是更可取的测量方法，因为计算组内相关系数可能会给出误导性的高可靠性估计。
