Hansen H, Beyer N, Frolich A, Godtfredsen N, Bieler T Intra- and inter-rater reproducibility of the 6-minute walk test and the 30-second sit-to-stand test in patients with severe and very severe COPD. Int J Chron Obstruct Pulmon Dis. 2018 Oct 18;13:3447-3457. doi: 10.2147/COPD.S174248. eCollection 2018.
Myles PS, Cui J Using the Bland-Altman method to measure agreement with repeated measures. Br J Anaesth. 2007 Sep;99(3):309-11. doi: 10.1093/bja/aem214. No abstract available.
Ozcan Kahraman B, Ozsoy I, Akdeniz B, Ozpelit E, Sevinc C, Acar S, Savci S Test-retest reliability and validity of the timed up and go test and 30-second sit to stand test in patients with pulmonary hypertension. Int J Cardiol. 2020 Apr 1;304:159-163. doi: 10.1016/j.ijcard.2020.01.028. Epub 2020 Jan 15.
Savva C, Giakas G, Efstathiou M, Karagiannis C Test-retest reliability of handgrip strength measurement using a hydraulic hand dynamometer in patients with cervical radiculopathy. J Manipulative Physiol Ther. 2014 Mar-Apr;37(3):206-10. doi: 10.1016/j.jmpt.2014.02.001. Epub 2014 Mar 11.
Shechtman O, Gestewitz L, Kimble C Reliability and validity of the DynEx dynamometer. J Hand Ther. 2005 Jul-Sep;18(3):339-47. doi: 10.1197/j.jht.2005.04.002.
Shrout PE Measurement reliability and agreement in psychiatry. Stat Methods Med Res. 1998 Sep;7(3):301-17. doi: 10.1177/096228029800700306.
Steffen TM, Hacker TA, Mollinger L Age- and gender-related test performance in community-dwelling elderly people: Six-Minute Walk Test, Berg Balance Scale, Timed Up & Go Test, and gait speeds. Phys Ther. 2002 Feb;82(2):128-37. doi: 10.1093/ptj/82.2.128.
Walter SD, Eliasziw M, Donner A Sample size and optimal designs for reliability studies. Stat Med. 1998 Jan 15;17(1):101-10. doi: 10.1002/(sici)1097-0258(19980115)17:13.0.co;2-e.
Reliability of 30 Seconds Sit-to-stand and Timed Up and Go in Adults With Long Covid
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
