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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