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Table 3 The results of the multivariate logistic regression analysis

From: Epidemiology and associated factors of gingivitis in adolescents in Guangdong Province, Southern China: a cross-sectional study

Variables

All

Urban

Rural

P interaction

OR (95% CI)

P

OR (95% CI)

P

OR (95% CI)

P

Age (year)

 12

Ref.

     

 13

1.030 (0.881, 1.201)

0.704

1.057 (0.854, 1.308)

0.609

1.011 (0.808, 1.265)

0.924

0.777

 14

1.216 (1.044, 1.415)

0.012

1.075 (0.869, 1.329)

0.507

1.419 (1.139, 1.768)

0.002

0.075

 15

0.699 (0.596, 0.821)

< 0.001

0.755 (0.605, 0.941)

0.013

0.646 (0.510, 0.818)

< 0.001

0.345

Gender

 Male

Ref.

     

 Female

0.968 (0.866, 1.081)

0.559

0.941 (0.806, 1.099)

0.443

0.986 (0.840, 1.157)

0.863

0.681

Only child

 No

Ref.

     

 Yes

1.236 (1.072, 1.425)

0.004

1.228 (1.037, 1.453)

0.017

1.333 (0.950, 1.870)

0.096

0.671

Father’s Education level

 ≤ 9 years

Ref.

      

 10–12 years

0.897 (0.768, 1.047)

0.167

0.902 (0.732, 1.111)

0.331

0.859 (0.678, 1.087)

0.206

0.762

 ≥ 13 years

0.926 (0.726, 1.181)

0.537

0.896 (0.670, 1.199)

0.461

1.015 (0.630, 1.635)

0.950

0.662

 Unclear

0.959 (0.757, 1.216)

0.729

0.797 (0.565, 1.123)

0.194

1.182 (0.843, 1.656)

0.332

0.108

Mother’s Education level

 ≤ 9 years

Ref.

      

 10–12 years

1.022 (0.859, 1.216)

0.807

0.994 (0.794, 1.243)

0.956

1.053 (0.795, 1.396)

0.718

0.751

 ≥ 13 years

0.902 (0.693, 1.173)

0.440

0.868 (0.644, 1.172)

0.356

1.199 (0.643, 2.235)

0.567

0.360

 Unclear

0.993 (0.785, 1.257)

0.956

1.002 (0.709, 1.414)

0.993

0.993 (0.715, 1.379)

0.968

0.973

Daily frequency of tooth brushing

 < 2 times/d

Ref.

     

 ≥ 2 times/d

0.915 (0.817, 1.025)

0.124

0.871 (0.745, 1.018)

0.083

0.983 (0.831, 1.163)

0.844

0.301

Dental floss

 Non daily

Ref.

      

 Daily

0.936 (0.779, 1.125)

0.484

0.817 (0.648, 1.031)

0.088

1.246 (0.920, 1.689)

0.155

0.031

Regular annual dental check-up

 No

Ref.

     

 Yes

0.870 (0.763, 0.993)

0.038

0.826 (0.691, 0.986)

0.035

0.942 (0.774, 1.147)

0.552

0.328

Calculus level

 ≤ 10%

Ref.

     

 > 10% and ≤ 30%

5.490 (4.882, 6.175)

< 0.001

4.556 (3.869, 5.365)

< 0.001

6.765 (5.699, 8.031)

< 0.001

0.001

  > 30%

15.803 (12.552, 19.896)

< 0.001

15.413 (11.094, 21.413)

< 0.001

16.852 (12.161, 23.354)

< 0.001

0.706

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