Table 6 Stepwise logistic regression of socio-demographic, normative social influence, social image, access to Toombak and ever Toombak use by intention to use Toombak among secondary school students in Khartoum State

 < 15 years

1

1

1

1

 ≥ 15 years

2.04 (0.91-4.60)

1.86 (0.80-4.28)

1.62 (0.69-3.83)

1.47 (0.59-3.63)

 Female

1

1

1

1

 Male

2.45 (1.04–5.78)*

1.88 (0.75–4.68)

1.94 (0.76–4.91)

0.74 (0.25–0.2.20)

 NO

1

1

1

 Yes

2.64 (0.56–12.51)

2.19 (0.45–10.54)

2.63 (0.52–13.21)

 Negative image

1

1

1

 Positive image

3.39 (1.47–7.76)**

3.16 (1.36–7.35)*

2.83 (1.18–6.83)*

 Direct access

1

1

 Indirect access

0.32 (0.12–0.83)*

0.38 (0.14–1.05)

 Ever user

1

 Non-users

0.13 (0.04–0.39)**