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作者对600名私人诊所的牙周病患者,在治疗后进行了长期追踪,女性391人(65.2%),男性209人(34.8%)。初诊时平均年龄为42岁,60.3%患者为35—49岁。全部患者追踪至少15年,平均观察年限为22
The authors conducted a long-term follow-up of patients with periodontal disease in 600 private clinics, 391 (65.2%) females and 209 males (34.8%) males. The average age at first visit was 42 years and 60.3% of patients were 35-49 years old. All patients were followed for at least 15 years with an average observation duration of 22 years