title: [An epidemiological survey on gingival bleeding among patients with untreated gingivitis].
abstract: OBJECTIVE
  To investigate the situation of gingival bleeding in patients with untreated gingivitis.
  
  
  METHODS
  Totally 444 patients with untreated gingivitis were enrolled in one district located in Beijing. The gingival bleeding, except the third molars, was evaluated using the gingival bleeding index (GBI).
  
  
  RESULTS
  The sites of GBI=1 were 8.15+/-7.17 in males and 5.65+/-5.65 in females (P=0.0003). The sites of GBI=2 were 33.48+/-21.65 among subjects aged 35-50 years and 24.31+/-18.15 among subjects aged 18-29 years (P=0.03). The first left mandible molars had the highest GBI, while the right maxillary incisors got the lowest GBI. The posterior teeth, the lingual surface, and the proximal region had more sites than the anterior teeth, the buccal surface, and the central region on GBI=1, GBI=2 and total sites P<0.05.
  
  
  CONCLUSIONS
  The severity of gingival bleeding is associated with age and gender, and tends to be site-specific.
authors.affiliation: Department of Stomatology, PUMC Hospital, CAMS and PUMC, Beijing 100730, China. lsclss@vip.sina.com
authors.forename: Jing-Hua
authors.initials: JH
authors.lastname: Zhang
authors.forename: Chun
authors.initials: C
authors.lastname: Li
authors.forename: Li-Li
authors.initials: LL
authors.lastname: Sun
authors.forename: Tao
authors.initials: T
authors.lastname: He
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005260:Female; D005884:Gingival Hemorrhage / Q000209:etiology*; D005891:Gingivitis / Q000150:complications*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010512:Periodontal Index; D012737:Sex Factors; D055815:Young Adult