Stratified sampling is often used when one or more of the stratums in the population have a low incidence relative to the other stratums. Convenience sampling is used in exploratory research where the researcher is interested in getting an inexpensive approximation of the truth.
Sometimes symptoms of a mental health disorder appear as physical problems, such as stomach pain, back pain, headache, or other unexplained aches and pains.
Mental health disorders occur in a variety of forms, and symptoms can overlap, making disorders hard to diagnoses. However, there are some common disorders that affect people of all ages.motional Symptoms of Mental Health Problems. Mental health problems can cause a wide variety of emotional symptoms, some of which include: 1  Changes in mood. 2  Erratic thinking. 3  Chronic anxiety.