Farrar JT, Polomano RC, Berlin JA, Strom BL A comparison of change in the 0-10 numeric rating scale to a pain relief scale and global medication performance scale in a short-term clinical trial of breakthrough pain intensity. Anesthesiology. 2010 Jun;112(6):1464-72. doi: 10.1097/ALN.0b013e3181de0e6d.
Farrar JT, Young JP Jr, LaMoreaux L, Werth JL, Poole MR Clinical importance of changes in chronic pain intensity measured on an 11-point numerical pain rating scale. Pain. 2001 Nov;94(2):149-158. doi: 10.1016/S0304-3959(01)00349-9.
Gordon D, Heimberg RG, Tellez M, Ismail AI A critical review of approaches to the treatment of dental anxiety in adults. J Anxiety Disord. 2013 May;27(4):365-78. doi: 10.1016/j.janxdis.2013.04.002. Epub 2013 Apr 13.
Gross PR Is pain sensitivity associated with dental avoidance? Behav Res Ther. 1992 Jan;30(1):7-13. doi: 10.1016/0005-7967(92)90090-4.
Humphris GM, Morrison T, Lindsay SJ The Modified Dental Anxiety Scale: validation and United Kingdom norms. Community Dent Health. 1995 Sep;12(3):143-50.
Larsen DL, Attkisson CC, Hargreaves WA, Nguyen TD Assessment of client/patient satisfaction: development of a general scale. Eval Program Plann. 1979;2(3):197-207. doi: 10.1016/0149-7189(79)90094-6. No abstract available.
Marks IM, Mathews AM Brief standard self-rating for phobic patients. Behav Res Ther. 1979;17(3):263-7. doi: 10.1016/0005-7967(79)90041-x. No abstract available.
Simons, J S., & Gaher, R. M. (2005). The Distress Tolerance Scale: Development and validation of a self-report measure. Motivation and Emotion, 29(2), 83-102. http://dx.doi.org/10.1007/s11031-005-7955-3
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.
