Table 2 Logistic regression model for severe periodontitis (stage III or IV)

Gender

 Men

1

1

 Women

0.8 (0.6–1.2)

1.0 (0.6–1.5)

Country of birth

 Non-western

1

1

 Western

0.3 (0.2–0.6)^a

0.4 (0.2–0.9)^a

Education

 Lower

1

1

 Higher

0.6 (0.4–0.9)^a

0.8 (0.5–1.3)

Diabetes II

 No

1

1

 Yes

3.7 (1.7–8.2)^a

2.5 (1.0–6.1)^a

Smoking

 Never smoker

1

1

 Former smoker

1.8 (1.2–2.8)^a

1.9 (1.2–2.9)^a

 Current smoker

5.4 (2.7–10.7)^a

5.8 (2.8–11.9)^a

Dental visits

 Non-regular

1

1

 Regular

0.3 (0.2–0.6)^a

0.5 (0.2–1.0)

Tooth brushing

 2 times daily

1

1

 < 2 times daily

0.9 (0.5–1.6)

1.6 (0.9–3.0)