Ahlen J, Ghaderi A Evaluation of the Children's Depression Inventory-Short Version (CDI-S). Psychol Assess. 2017 Sep;29(9):1157-1166. doi: 10.1037/pas0000419. Epub 2016 Dec 5.
Avenevoli S, Swendsen J, He JP, Burstein M, Merikangas KR Major depression in the national comorbidity survey-adolescent supplement: prevalence, correlates, and treatment. J Am Acad Child Adolesc Psychiatry. 2015 Jan;54(1):37-44.e2. doi: 10.1016/j.jaac.2014.10.010. Epub 2014 Oct 29.
Davila J, Mattanah J, Bhatia V, et al Romantic competence, healthy relationship functioning, and well-being in emerging adults. Pers Relatsh. 2017;24(1):162-184. doi:10.1111/pere.12175
Kroenke K, Spitzer RL, Williams JB The PHQ-9: validity of a brief depression severity measure. J Gen Intern Med. 2001 Sep;16(9):606-13. doi: 10.1046/j.1525-1497.2001.016009606.x.
Schleider JL, Weisz JR Little Treatments, Promising Effects? Meta-Analysis of Single-Session Interventions for Youth Psychiatric Problems. J Am Acad Child Adolesc Psychiatry. 2017 Feb;56(2):107-115. doi: 10.1016/j.jaac.2016.11.007. Epub 2016 Nov 25.
Spitzer RL, Kroenke K, Williams JB, Lowe B A brief measure for assessing generalized anxiety disorder: the GAD-7. Arch Intern Med. 2006 May 22;166(10):1092-7. doi: 10.1001/archinte.166.10.1092.
Zhang WC, Jia CX, Hu X, Qiu HM, Liu XC Beck Hopelessness Scale: Psychometric Properties Among Rural Chinese Suicide Attempters and Non-Attempters. Death Stud. 2015;39(7):442-6. doi: 10.1080/07481187.2014.970300. Epub 2015 Feb 13.
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.