The U.S. Centers for Disease Control and Prevention in Atlanta, Georgia, tracked rates of depression and suicide nation-wide from 2007 through 2010. Here's what they found:

1. Nearly 8 percent of people age 12 years and older (6 percent of males and 10 percent of females) reported current depression.

2. Females have higher rates of depression than males in every age group.

3. Males aged 40–59 years have higher rates of depression (7 percent) than males aged 60 years and older (5 percent).

4. Females aged 40–59 years have higher rates of depression (12 percent) than females aged 12–17 years (8 percent) and females age 60 and older (7 percent).

5. Number of suicide deaths: 39,518

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Not every depressed person exhibits the same symptoms. the indicators vary according to the severity of the depression, the age of the person and other factors. Here are some common signs and symptoms compiled by the National Institutes of Health:

1. Persistent sad, anxious, or "empty" feelings

2. Feelings of hopelessness or pessimism

3. Feelings of guilt, worthlessness, or helplessness Irritability, restlessness

4. Loss of interest in activities or hobbies once pleasurable, including sex

5. Fatigue and decreased energy

6. Difficulty concentrating, remembering details, and making decisions

7. Insomnia, early-morning wakefulness, or excessive sleeping

8. Overeating, or appetite loss

9. Thoughts of suicide, suicide attempts

10. Aches or pains, headaches, cramps, or digestive problems that do not ease even with treatment