Irvin Yalom was the first person to put a theoretical perspective on group work. He believed that all groups go through specific phases:
1. Pre-group
2. Forming
3. Storming
4. Norming
5. Performing
6. Adjourning
During the forming phase:
* Members appear concerned about self-disclosure and rejection
* Goals and expectations are identified
* Boundaries between the leader and participants are established
* Trust and rapport begin to develop

CYP2D6 is a gene that codes for an enzyme involved in the metabolism of many psychotropic medications, including antidepressants, antipsychotics, and opioids. Variations in the CYP2D6 gene can affect the individual's ability to metabolize these medications, leading to an increased risk of side effects or reduced efficacy. Therefore, PMHNP should be aware of the patient's CYP2D6 genotype when prescribing these medications.
The APOE gene is associated with Alzheimer's disease, the SLC6A4 gene is associated with the serotonin transporter, and the HTR2A gene is associated with serotonin receptor 2A. These genes may play a role in the development of psychiatric disorders but not in the metabolism of psychotropic medications.

The Centers for Medicare and Medicaid Services (CMS) administer the two major public insurance programs, Medicaid and Medicare.
Medicaid is funded by both federal and state tax dollars. In 2011, Medicaid provided health care for 60 million eligible persons, 85% of whom were children. Those eligible for Medicaid include the following:
* Low-income children
* Low-income pregnant women
* Elderly and disabled individuals who qualify for the Supplemental Security Income Program Medicare is funded by federal tax dollars. In 2011, it provided health care for 47 million eligible people. Those eligible for Medicare include the following:
* Those age 65 and older having worked 40 quarters and paid Medicare taxes
* Certain younger individuals with disabilities
* Individuals with end-stage renal disease
* Individuals in need of a kidney transplant
* Individuals receiving Social Security Disability and who have amyotrophic lateral sclerosis The presence or absence of amyotrophic lateral sclerosis is unlikely to impact an individual's Medicaid eligibility.

Mean, standard deviation, and variance are all examples of descriptive statistics. External validity is an example of a concept for interpreting research findings and generalizing their applicability.

The Hamilton Anxiety Scale (HAM-A) is the most commonly used clinician-administered anxiety rating scale. It is best used in the evaluation of anxiety severity and tracking the efficacy of anxiety treatments over time. The HAM-A is based on various domains of anxiety including anxious mood, fears, sleep disturbance, somatic complaints, tension, and observed behavior. The severity of each domain is ranked from 0 (not present) to 4 (severe). Scoring is as follows:
* Score of 14-17: Mild anxiety
* Score of 18-24: Moderate anxiety
* Score of 25-30: Severe anxiety