Table 5 Oral hygiene status and gingival bleeding regressed on socio-demographic characteristics and statistically significant interactions

 Monduli

1

1

 Longido

2.6 (1.6–4.4)

< 0.001

0.6 (0.4–0.8)

0.002

 Male

1

1

 Female

2.0 (1.4–2.5)

< 0.001

0.5 (0.4–0.6)

< 0.001

 12–14 years

1

1

 15–17 years

0.8 (0.4–1.5)

0.519

1.6 (1.0–2.5)

0.053

 Others

1

1

 Arusha

1.0 (0.7–1.5)

0.794

2.0 (1.2–3.3)

0.005

 Maasai

1

1

 Non-Maasai

1.4 (0.9–2.4)

0.140

0.6 (0.4–0.9)

0.008

 Most poor

1

 Least poor

1.3 (0.8–2.0)

0.323

 Maasai x most poor

1

 Non Maasai x least poor

2.8 (1.1–7.2)

0.038

 Maasai x Males

1

 Non Maasai x Female

2.5 (1.2–5.4)

0.019