Prevalence and severity of gingivitis in American adults

Am J Dent. 2010 Feb;23(1):9-13.


Purpose: To investigate prevalence and severity of gingivitis in representative American adults.

Methods: Subjects (1,000) in Loma Linda, California; Seattle, Washington; and Boston, Massachusetts were examined for Löe-Silness Gingivitis Index (GI). Mann-Whitney rank sum test was used to determine significances in the GI between genders. The data among study sites and races were compared using the Kruskal-Wallis one-way ANOVA on ranks. The correlation of the GI and age was examined by the Spearman rank order correlation. Age differences among three sites were analyzed using the one-way ANOVA.

Results: The race composition of the subjects (mean age 37.9) approximated to the 2004 U.S. Census data. The overall average GI was 1.055. Only 6.1% of subjects showed mean GI<0.50; most (93.9%) were > or = 0.50, with 55.7% > or = 1.00. There was a significant correlation (P<0.001) between the age and GI. The males' GI was significantly higher (P<0.001) than the females'; African-Americans showed a significantly higher GI (P<0.05) than other races except for the Native-Americans.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Analysis of Variance
  • Ethnic Groups
  • Female
  • Gingivitis / epidemiology*
  • Humans
  • Linear Models
  • Male
  • Middle Aged
  • Periodontal Index
  • Prevalence
  • Severity of Illness Index
  • Statistics, Nonparametric
  • Surveys and Questionnaires
  • United States / epidemiology
  • Urban Population
  • Young Adult