Results: The early onset group had stronger family history of mental illness,and the first rank relatives of them had higher onset risk of schizophrenia and higher hereditary than late onset group.

• 结果:早发组有精神病家族史多,一级亲属中精神分裂症的发病风险率高,一级亲属的遗传率高,与晚发组比较,有明显的差异性。