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Table 2 The mean number of sextants with healthy gums of the studied young adults according to their socio-demographic background (n = 324)

From: Risk indicators of oral health status among young adults aged 18 years analyzed by negative binomial regression

  n Mean Number of sextants with healthy gums (SD) p*
Gender    0.001
 Male 177 1.38 (1.71)  
 Female 147 1.83 (1.58)  
Parental educational attainment   0.797
 Primary or below 39 1.69 (1.81)  
 Junior high school 82 1.46 (1.65)  
 Senior high school 134 1.57 (1.65)  
 Matriculation or above 32 1.78 1.54)  
 Do not know 37 1.65 1.75)  
Monthly household income level   0.593
 Below HK$20,000 236 1.57 (1.67)  
 Above HK$20,000 78 1.62 (1.58)  
Dental insurance coverage    0.948
 No 218 1.58 (1.62)  
 Yes 31 1.65 (1.80)  
 Do not know 75 1.59 (1.76)  
  1. * p-value was computed from Mann–Whitney U test or Kruskal Wallis 1-way ANOVA test to compare the distributions between groups.