Table 3 Correlations (aOR, 95% CI) of NCD behavioural risk factors in secondary school students in Douala, Cameroon

Age

1.2 (1,1.5)

0.8 (0.6,1.1)

1.1 (0.9,1.3)

0.8 (0.7,0.9)

0.8 (0.4,1.8)

1.3 (0.9,1.9)

1 (0.8,1.2)

Boys (ref: girls)

0.9 (0.6,1.4)

2 (1,4.7)

0.7 (0.5,1.1)

1.2 (0.8,1.7)

0.9 (0.2,3.4)

3.6 (1.5,8.9)

0.2 (0.1,0.3)

Class (ref: 5th year)

 6th_year

0.9 (0.5,1.6)

1.5 (0.6,4)

1.1 (0.6,2)

1.7 (1,2.8)

1.9 (0.2,20.3)

0.8 (0.2,2.6)

0.5 (0.3,1)

 7th_year

0.6 (0.3,1.1)

1.8 (0.7,4.8)

1.3 (0.7,2.4)

1.2 (0.7,1.9)

2.3 (0.3,18.9)

0.6 (0.2,1.8)

0.8 (0.4,1.5)

Science subject (ref: arts)

0.7 (0.5,1.2)

0.5 (0.2,1.2)

0.8 (0.4,1.2)

0.8 (0.5,1.2)

1.1 (0.2,6.5)

1.7 (0.6,5.7)

0.9 (0.5,1.5)

Father’s education (ref: < Primary)

 Secondary

1.6 (0.7,3.5)

.

1 (0.4,2.3)

1 (0.5,1.9)

.

1.9 (0.4,13.5)

1.5 (0.6,3.6)

 Tertiary

1.8 (0.8,4)

.

0.9 (0.4,2)

1.4 (0.7,2.7)

.

1 (0.2,8.2)

1.1 (0.5,2.9)

Mother’s education (ref: < Primary)

 Secondary

2.4 (1.3,4.7)

0.2 (0,1.3)

0.8 (0.4,1.6)

1.4 (0.8,2.5)

.

1.3 (0.4,5.1)

0.5 (0.2,1)

 Tertiary

1.9 (1,3.9)

0.4 (0,1.9)

0.9 (0.4,1.8)

1.2 (0.7,2.3)

.

0.7 (0.2,3.7)

0.8 (0.4,1.8)

Guardian (ref: both parents)

 One Parent

1.1 (0.6,1.9)

2.1 (0.7,9.1)

0.7 (0.4,1.2)

0.9 (0.6,1.5)

1.1 (0.2,5)

0.7 (0.1,2.8)

0.9 (0.5,1.6)

 Other

0.7 (0.4,1.1)

1.9 (0.7,5.9)

0.7 (0.4,1.1)

0.6 (0.4,1)

.

1.8 (0.6,4.8)

0.9 (0.5,1.6)

Inadequate knowledge

1 (0.6,1.4)

1.1 (0.6,2.2)

1.3 (0.9,2)

1 (0.7,1.4)

1.1 (0.3,4.2)

3.6 (1.4,10.3)

0.7 (0.5,1.1)