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Table 2 Univariate and stepwise logistic regression on possible risk factor for calculus

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

Factor Univariate Stepwise
p value OR 95% CI for OR p value OR 95% CI for OR
Gender
 Male < 0.001 1.26 1.23 1.29 < 0.001 1.26 1.22 1.30
 Femalea         
Age < 0.001     < 0.001    
 12   0.57 0.55 0.59 < 0.001 0.55 0.53 0.57
 13   0.66 0.64 0.68 < 0.001 0.64 0.62 0.67
 14   0.81 0.79 0.84 < 0.001 0.80 0.77 0.83
 15a         
Region < 0.001     < 0.001    
 East   0.74 0.72 0.76 < 0.001 0.82 0.79 0.85
 West   1.50 1.45 1.54 < 0.001 1.39 1.34 1.45
 Centrala         
Living place
 Urban 0.001 0.96 0.94 0.98 .069 1.02 1.00 1.06
 Rurala         
Ethnic group
 Han < 0.001 0.66 0.64 0.69 .001 0.92 0.88 0.97
 Minoritya         
Family structure
 One-child family < 0.001 0.68 0.66 0.69 < 0.001 0.78 0.76 0.81
 With siblingsa         
Father education < 0.001     .002    
 Middle school   1.86 1.78 1.94 .001 1.11 1.04 1.17
 High school   1.40 1.35 1.45 .085 1.04 0.99 1.10
 Universitya         
Mother education < 0.001     < 0.001    
 Middle school   1.90 1.82 1.98 < 0.001 1.21 1.14 1.28
 High school   1.39 1.34 1.44 .001 1.09 1.04 1.15
 Universitya         
Brush teeth
 Yes < 0.001 0.61 0.58 0.63 < 0.001 0.69 0.66 0.73
 Noa         
Dental floss
 Yes < 0.001 0.67 0.64 0.69 < 0.001 0.78 0.75 0.82
 Noa         
Smoking
 Yes < 0.001 1.59 1.51 1.68 .009 1.08 1.02 1.15
Noa         
Oral health knowledge < 0.001    
 0–3   1.25 1.21 1.29 < 0.001 1.10 1.06 1.14
 4–5   1.24 1.20 1.27 < 0.001 1.13 1.09 1.16
 6–8a         
Oral health attitude
 Negative 0.001 1.04 1.02 1.07     
 Positivea         
Constant      < 0.001 3.30   
  1. aReference category