Table 4 Odds ratios for susceptibility to smoking by selected characteristics (with 95% confidence interval), adjusting for susceptibility at previous time point

Existing susceptibility

10.7 (5.8-20.5)

8.6 (4.6-16.8)

Intervention: Control

Reference

Reference

Intervention: Intervention

0.8 (0.4-1.6)

0.7 (0.3-1.3)

Rebelliousness

1.1 (0.9-1.2)

1.1 (1.0-1.2)

Friends with a smoker

2.8 (1.4-5.3)

1.4 (0.7-2.7)

Smoking presence: Never

Reference

Reference

Smoking presence: Sometimes

1.0 (0.4-2.5)

1.9 (0.8-4.9)

Smoking presence: Frequently

1.2 (0.5-2.8)

3.0 (1.3-7.7)

Nominated friends susceptible

2.3 (0.5-9.0)

1.4 (0.4-5.6)

Nominators susceptible

0.7 (0.2-2.4)

3.5 (1.0-12.8)