I base it on my experience as a pedi Nurse.
"Suicide Statistics
Although suicide is relatively rare among children, the rate of suicide attempts and suicide deaths increases tremendously during adolescence. Suicide is the third-leading cause of death for 15- to 24-year-olds, according to the Centers for Disease Control and Prevention (CDC), surpassed only by accidents and homicide.
The risk of suicide increases dramatically when kids and teens have access to firearms at home, and nearly 60% of all suicides in the United States are committed with a gun. That's why any gun in your home should be unloaded, locked, and kept out of the reach of children and teens. Ammunition should be stored and locked apart from the gun, and the keys for both should be kept in a different area from where you store your household keys. Always keep the keys to any firearms out of the reach of children and adolescents.
It's important to understand how suicide rates are different for boys and girls. Girls think about and attempt suicide about twice as often as boys, and girls tend to attempt suicide by overdosing on drugs or cutting themselves. Boys die by suicide about four times as much as girls, perhaps because they tend to use more lethal methods, such as firearms, hanging, or jumping from heights."
http://www.kidshealth.org/parent/emotions/behavior/suicide.html"Teen suicide attempts are calls for help
Many teenagers have thoughts of death. These can stem from a variety of causes, and can result in actual attempts on their own lives. It is important to take suicide attempts seriously. While there is no way to reliably figure the exact ratio of attempted suicides to completed suicides, the National Institute of Mental Health believes that as many as 25 suicides are attempted for each one that is completed. That means that for every teen suicide that you hear of, there are probably at least 25 suicide attempts made. And this does not even cover the teenage suicide attempts and completed suicides that are never heard about. Understanding that a teen suicide attempt is a call for help is essential in preventing a completed attempt later.
Teen suicide statistics and gender
Teen suicide statistics draw a correlation between gender and suicide. It is interesting to note that there are some very clear indications that suicide is different for males and females, attempted and completed suicides alike. For example, males are four times more likely to die from suicide than females. However, teen girls are more likely than teen boys to attempt suicide. So, even though teenage girls make more attempts on their own lives than teenage boys, the boys are more likely to actually complete a suicide attempt. They do not allow for intervention, and are less likely to “call for help” through a suicide attempt, since there is often little opportunity to get males into treatment since their suicide completion rate is higher than that of females."
/www.teensuicide.us/articles.html
I could bore you with the CDC stats but these were a little more palatable. Except for this sudden uptick-the rates, by method and gender have been farily consistent for years now.