The data so far, anywhere in the world, is only for about ten years. Individuals make an average of four or five attempts to get help, from family physicians, emergency wards, distress lines, etc. Many professionals shrug off the difficulties a teenager is having as normal for a teenager, their hormones, their rapid growth. You can't help but wonder why we generally don't take teenagers' troubles seriously. The stigma of mental illness has also meant that very few people know anything about it.
Most family members have no idea what is happening when their child starts behaving bizarrely.
In London some people have continuing problems with the diseases of bipolar disorder and schizophrenia in spite of the best care. This is partly because their social development has led to them to a point where all of their friends are taking drugs recreationally. Dr. Malla has found marijuana precipitates a psychotic episode years before one would normally occur, perhaps in people who otherwise would never have one. From what I heard in London the teenagers generally do recover quite well, return to school, and to work. They don't enter the population of the mentally ill.