Table 2 Bivariate analysis between the independent variables: socio-demographic and health indicators, and the outcomes: caries experience (DMFT > 0), OHI-S, TDI and C-OIDP with odds ratio (OR) and 95% confidence interval (CI)

Age

   Under 12

1

1

1

1

-

   12 and above

0.1 (0.0–0.3)

0.07 (0.0–0.3)

0.9 (0.4–2.4)

1.8 (0.6–5.5)

Gender

   Girls

1

1

1

1

1

   Boys

0.7 (0.3–1.8)

1.1 (0.2–5.4)

0.9 (0.3–2.4)

0.8 (0.2–2.8)

0.8 (0.6–1.1)

Residence

   Non boarders

1

1

1

1

1

   Boarders

0.9 (0.4–2.1)

0.8 (0.2–3.4)

1.0 (0.4–2.6)

0.5 (0.2–1.5)

1.1 (1.0–1.4)

Mother education

   Not educated

1

1

1

1

1

   Educated

0.5 (0.2–1.3)

0.6 (0.2–2.6)

0.6 (0.2–2.0)

2.2 (0.4–10.7)

0.4 (0.0–6.7)

Father education

   Not educated

1

1

1

1

1

   Educated

0.8 (0.3–2.5)

1.8 (0.3–9.1)

0.8 (0.2–2.6)

0.4 (0.1–1.5)

0.3 (0.0–5.6)

Mother occupation

   Not working

1

1

1

1

1

   Working

0.5 (0.2–1.1)

0.7 (0.2–2.4)

0.8 (0.3–2.0)

1.1 (0.3–3.6)

0.8 (0.7–1.1)

Father occupation

   Not working

1

1

1

1

1

   Working

0.8 (0.3–2.1)

0.8 (0.2–3.3)

2.2 (0.8–6.5)

0.5(0.2–1.8)

0.2 (0.0–3.5)

Oral health

Caries experience

   No

-

-

1

1

1

   Yes

2.0 (0.8–5.2)

0.3 (0.1–1.2)

1.3 (0.9–1.7)

OHI-S

   Good

1

1

-

1

1

   Poor

2.0 (0.8–5.2)

1.9 (0.6–6.7)

0.6 (0.2–1.7)

1.1 (1.0–1.3)

TDI

   No trauma

1

1

1

-

1

   Present

0.3 (0.1–1.2)

0.8 (0.2–4.0)

0.6 (0.8–1.7)

1.0 (0.8–1.0)

Visual impairment

   Complete (CVI)

1

1

1

4.3 (1.1–16.5)*

1.3 (0.4–5.0)

   Partial (PVI)

3.3 (1.4–8.1)*

6.3 (1.7–22.7)*

3.0 (1.1–8.2)*

1

1