Table 4 Odds ratios (OR) and their 95% confidence intervals (CI) of tobacco use by adolescents' predicted social mobility, statistically significant odds ratios in bold.

Mobility 1* (N = 1090)

Stable in low SES

6.5 (2.7-15.7)

P < 0.001

6.0 (2.4-14.8)

P < 0.001

6.1 (2.4-15.3)

P < 0.001

5.2 (2.2-12.1)

P < 0.001

4.8 (2.0-11.5)

P < 0.001

4.7 (1.8-12.1)

P = 0.001

Downwardly mobile

2.9 (1.4-6.2)

P = 0.006

2.4 (1.1-5.3)

P = 0.025

2.1 (0.9-4.8)

P = 0.064

3.1 (1.6-6.2)

P = 0.001

2.5 (1.2-5.0)

P = 0.009

2.6 (1.2-5.4)

P = 0.011

Upwardly mobile

1.3 (0.6-2.9)

P = 0.492

1.2 (0.5-2.8)

P = 0.596

1.1 (0.5-2.7)

P = 0.742

0.6 (0.2-1.2)

P = 0.312

0.5 (0.2-1.4)

P = 0.229

0.6 (0.2-1.7)

P = 0.391

Stable in high SES

1.0

1.0

1.0

1.0

1.0

1.0

Mobility 2** (N = 1095)

Stable in low SES

6.2 (2.8-13.7)

P < 0.001

5.0 (2.2-11.5)

P < 0.001

4.6 (2.0-10.9)

P < 0.001

4.2 (1.9-9.1)

P < 0.001

3.5 (1.6-7.8)

P = 0.002

3.4 (1.4-8.2)

P = 0.006

Downwardly mobile

3.3 (1.2-8.8)

P = 0.017

2.8 (1.0-7.5)

P = 0.046

2.6 (1.0-7.2)

P = 0.058

3.9 (1.6-9.3)

P = 0.002

3.2 (1.3-7.7)

P = 0.010

3.8 (1.5-9.6)

P = 0.004

Upwardly mobile

1.5 (0.7-2.9)

P = 0.249

1.3 (0.6-2.6)

P = 0.490

1.2 (0.6-2.5)

P = 0.570

1.0 (0.5-2.0)

P = 0.953

0.9 (0.4-1.7)

P = 0.714

1.0 (0.5-2.1)

P = 0.941

Stable in high SES

1.0

1.0

1.0

1.0

1.0

1.0