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Table 1 Univariate and stepwise logistic regression on possible risk factor for gingival bleeding

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 1.12 1.09 1.15  < 0.001 1.11 1.08 1.14
 Femalea         
Age < 0.001     < 0.001    
 12   0.77 0.74 0.79 < 0.001 0.75 0.72 0.78
 13   0.82 0.79 0.85 < 0.001 0.81 0.78 0.84
 14   0.85 0.82 0.88 < 0.001 0.83 0.80 0.86
 15a         
Region  < 0.001     < 0.001    
 East   0.81 0.79 0.84 < 0.001 0.86 0.83 0.89
 West   1.19 1.15 1.22 .004 1.05 1.02 1.09
 Centrala         
Living place
 Urban < 0.001 1.06 1.04 1.09  0.001 1.10 1.07 1.13
 Rurala         
Ethnic group
 Han < 0.001 0.67 0.65 0.70 < 0.001 0.77 0.74 0.80
 Minoritya         
Family structure
 One-child family  < 0.001 0.74 0.73 0.76  < 0.001 0.81 0.79 0.84
 With siblingsa         
Father education < 0.001     .001    
 Middle school   1.50 1.44 1.56 .005 1.09 1.03 1.15
 High school   1.29 1.25 1.34  < 0.001 1.09 1.04 1.15
 Univeristya         
Mother education < 0.001     .045    
 Middle school   1.50 1.44 1.56 .041 1.06 1.00 1.12
 High school   1.25 1.21 1.30 .397 1.02 .97 1.07
 Univerisitya         
Smoking
 Yes < 0.001 1.20 1.15 1.26     
 Noa         
Brush teeth
 Yes  < 0.001 0.64 0.61 0.66  < 0.001 0.69 0.66 0.73
 Noa         
Dental floss
 Yes < 0.001 0.81 0.78 0.84 < 0.001 0.89 0.85 0.93
 Noa         
Oral health knowledge < 0.001     < 0.001    
 0–3   1.32 1.28 1.36 < 0.001 1.21 1.16 1.25
 4–5   1.18 1.15 1.22 < 0.001 1.12 1.09 1.16
 6–8a         
Oral health attitude
 Negative 0.002 1.04 1.02 1.97     
 Positivea         
Constant       < 0.001 2.83   
  1. aReference category