Charlson ME, Pompei P, Ales KL, MacKenzie CR A new method of classifying prognostic comorbidity in longitudinal studies: development and validation. J Chronic Dis. 1987;40(5):373-83. doi: 10.1016/0021-9681(87)90171-8.
Li WY, Chau PH, Dai Y, Tiwari AF The Prevalence and Negative Effects of Thoracic Hyperkyphosis on Chinese Community-Dwelling Older Adults in Wuhan, Hubei Province, China. J Nutr Health Aging. 2021;25(1):57-63. doi: 10.1007/s12603-020-1441-1.
Muir SW, Berg K, Chesworth B, Klar N, Speechley M Quantifying the magnitude of risk for balance impairment on falls in community-dwelling older adults: a systematic review and meta-analysis. J Clin Epidemiol. 2010 Apr;63(4):389-406. doi: 10.1016/j.jcline
Rossier A, Pruijm M, Hannane D, Burnier M, Teta D Incidence, complications and risk factors for severe falls in patients on maintenance haemodialysis. Nephrol Dial Transplant. 2012 Jan;27(1):352-7. doi: 10.1093/ndt/gfr326. Epub 2011 Jun 7.
Wang HH, Wu JL, Lee YC, Ho LC, Chang MY, Liou HH, Hung SY Risk of Serious Falls Between Hemodialysis and Peritoneal Dialysis Patients: A Nationwide Population-based Cohort Study. Sci Rep. 2020 May 8;10(1):7799. doi: 10.1038/s41598-020-64698-7.
Investigating the Prevalence of Hyper Kyphosis and Forward Head Posture in Dialysis Patients
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.
