其他研究也一致表明每一代人的发病率都在增加，有人指出，如果旧的统计数字是错的，则错在低估了精神疾病的普遍性。
Other studies have consistently shown rising rates of prevalence with each successive generation, and it is argued that, if older statistics were faulty, they erred on the side of underestimating the spread of mental illness.