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Table 4 The generalized linear mixed model of calculus

From: Related factors of periodontal health among Chinese middle school students, findings from a national cross-sectional survey

  Coefficient Sig. Exp (coefficient) 95% CI for exp (coefficient)
Lower Upper
Intercept 1.17   3.23 2.34 4.47
Gender
 Male 0.28 < 0.001 1.32 1.28 1.36
 Femalea      
Age
 12 − 0.67 < 0.001 0.51 0.49 0.53
 13 − 0.48 < 0.001 0.62 0.59 0.64
 14 − 0.25 < 0.001 0.78 0.75 0.82
 15a      
Ethnic group
 Han − 0.10 .003 0.91 0.86 0.96
 Minoritya      
Family structure
 One-child family − 0.13 < 0.001 0.88 0.85 0.91
With siblingsa      
Father education
 Middle school 0.23 < 0.001 1.26 1.20 1.33
 High school 0.11 < 0.001 1.12 1.08 1.17
 Universitya      
Brush teeth
 Yes − 0.11 < 0.001 0.90 0.85 0.95
 Noa      
Dental floss
 Yes − 0.18 < 0.001 0.83 0.79 0.87
 Noa      
Oral health knowledge
 0–3 0.06 .002 1.06 1.02 1.11
 4–5 0.06 .001 1.06 1.03 1.09
 6–8a      
  1. aReference category