What you cited was information related to Jehovah's Witnesses being imprisoned because of religious intolerance. Whoever the people were that made any claims obviously worked to the detriment of the test subjects. No medical professional of integrity would pursue this venue for research purposes unless it was a mad scientist like the Nazi physician Josef Mengele. Because of this in itself it doesn't meet the criteria of quality research.
http://www.surgeongeneral.gov/library/mentalhealth/summary.html
The U.S. Congress declared the 1990s the Decade of the Brain. In this decade we have learned much through research—in basic neuroscience, behavioral science, and genetics—about the complex workings of the brain. Research can help us gain a further understanding of the fundamental mechanisms underlying thought, emotion, and behavior—and an understanding of what goes wrong in the brain in mental illness. It can also lead to better treatments and improved services for our diverse population.
http://www.surgeongeneral.gov/library/mentalhealth/chapter8/sec1.html
Also, as this Surgeon General’s report emphasizes, high-quality research is a potent weapon against stigma, one that forces skeptics to let go of misconceptions and stereotypes concerning mental illness and the burdens experienced by persons who have these disorders.
A description of various stressful life events is explained here:
http://www.surgeongeneral.gov/library/mentalhealth/chapter4/sec1_1.html#stressful
Interventions for Stressful Life Events
Stressful life events, even for those at the peak of mental health, erode quality of life and place people at risk for symptoms and signs of mental disorders. There is an ever-expanding list of formal and informal interventions to aid individuals coping with adversity. Sources of informal interventions include family and friends, education, community services, self-help groups, social support networks, religious and spiritual endeavors, complementary healers, and physical activities. As valuable as these activities may be for promoting mental health, they have received less research attention than have interventions for mental disorders. Nevertheless, there are selected interventions to help people cope with stressors, such as bereavement programs and programs for caregivers (see Chapter 5) as well as couples therapy and physical activity.
Medical records are confidential unless permission is granted from the patient to release the records. To assess the mental health of Jehovah's Witnesses it's best to do this from the inside, than from the outside looking in as to whether they can attest to the validity of such information:
http://www.surgeongeneral.gov/library/mentalhealth/chapter1/sec1.html#mental_points
As will be evident in the pages that follow, “mental health” and “mental illness” are not polar opposites but may be thought of as points on a continuum. Mental health is a state of successful performance of mental function, resulting in productive activities, fulfilling relationships with other people, and the ability to adapt to change and to cope with adversity. Mental health is indispensable to personal well-being, family and interpersonal relationships, and contribution to community or society. It is easy to overlook the value of mental health until problems surface. Yet from early childhood until death, mental health is the springboard of thinking and communication skills, learning, emotional growth, resilience, and self-esteem. These are the ingredients of each individual’s successful contribution to community and society. Americans are inundated with messages about success—in school, in a profession, in parenting, in relationships—without appreciating that successful performance rests on a foundation of mental health.
w99 3/15 p. 23 Do Not Be Overcome by Anxiety
Philippians 4:6, 7 answers: “Do not be anxious over anything, but in everything by prayer and supplication along with thanksgiving let your petitions be made known to God; and the peace of God that excels all thought will guard your hearts and your mental powers by means of Christ Jesus.” Yes, in response to our persistent prayers and supplications, Jehovah can give us an inner calm that protects our minds from being disturbed by unnecessary anxieties.—Jeremiah 17:7, 8; Matthew 6:25-34.