Table 3 Results of logistic regression models including film exposure quartiles, (a) unadjusted and (b-f) adjusted for potential confounders - ORs (95% CIs).

Alcohol/drug use in movies seen

(a) unadjusted

Quartile 1

Quartile 2

(0.67-1.47)

(0.78-1.62)

(0.64-1.32)

(0.39-1.36)

Quartile 3

(0.73-1.61)

(0.84-1.75)

(1.01-2.10)

(0.75-2.26)

Quartile 4

(1.06-2.29)

(1.10-2.30)

(1.24-2.62)

(0.91-2.69)

(b) adjusted for gender

Quartile 1

Quartile 2

(0.67-1.50)

(0.79-1.64)

(0.64-1.33)

(0.39-1.40)

Quartile 3

(0.71-1.59)

(0.83-1.74)

(0.95-1.99)

(0.69-2.12)

Quartile 4

(0.99-2.17)

(1.04-2.19)

(1.14-2.43)

(0.82-2.46)

(c) adjusted for gender and background

(parental social class, parental

structure, PBI care and control)

Quartile 1

Quartile 2

(0.70-1.58)

(0.83-1.75)

(0.64-1.34)

(0.38-1.34)

Quartile 3

(0.74-1.68)

(0.86-1.84)

(0.95-2.02)

(0.70-2.18)

Quartile 4

(1.04-2.30)

(1.09-2.33)

(1.14-2.46)

(0.86-2.62)

(d) adjusted for gender, background

and personal characteristics

(take risks, rule-breaker, 'Highers')

Quartile 1

Quartile 2

(0.61-1.41)

(0.76-1.63)

(0.52-1.15)

(0.31-1.19)

Quartile 3

(0.68-1.57)

(0.81-1.74)

(0.86-1.89)

(0.63-2.13)

Quartile 4

(0.95-2.13)

(1.01-2.19)

(0.99-2.24)

(0.76-2.56)

(e) adjusted for gender, background,

personal characteristics and friends'

drinking status/cannabis use (as appropriate)

Quartile 1

Quartile 2

(0.52-1.23)

(0.63-1.41)

(0.48-1.13)

(0.26-1.12)

Quartile 3

(0.61-1.44)

(0.71-1.58)

(0.78-1.86)

(0.53-1.99)

Quartile 4

(0.82-1.89)

(0.86-1.91)

(0.85-2.09)

(0.64-2.39)

(f) adjusted for gender, background,

personal characteristics, friends'

drinking/cannabis and own tv, dvd

or video hours.

Quartile 1

Quartile 2

(0.52-1.23)

(0.63-1.41)

(0.49-1.17)

(0.26-1.14)

Quartile 3

(0.61-1.45)

(0.71-1.60)

(0.82-1.96)

(0.55-2.09)

Quartile 4

(0.82-1.90)

(0.86-1.92)

(0.90-2.22)

(0.66-2.47)

(N in each analysis)