Table 5 Multivariate logistic regression analysis (final reduced model) (*) on potential risk factors towards periodontitis.

From: Study of Periodontal Health in Almada-Seixal (SoPHiAS): a cross-sectional study in the Lisbon Metropolitan Area

Predictor variables

Odds Ratio (OR)

OR (95% CI)

p-value

Age

1.05

1.04–1.06

<0.001

Education

Higher

1

Middle

2.08

1.32–3.27

0.002

Elementary

1.86

1.13–3.05

0.015

No education

2.08

0.88–4.90

0.095

Smoking status

<0.001

Non-smoker

1

Current Smoker

3.76

2.44–5.80

<0.001

Former smoker

2.11

1.52–2.91

<0.001

Diabetes Mellitus

No

1

Yes

1.53

1.06–2.21

0.023

  1. *The model was statistically significant, χ2(7) = 174.786, p < 0.001, explained 20.5% (Nagelkerke R2) of the variance and correctly classified 68.7% of cases.