Table 1 Guidelines topics covered in online survey, number of items, and example items and responses

Knowledge about alcohol

22

True/False

-11 items about risks associated with adolescent drinking

- serious injury (true positive); hair turning grey at a younger age (false positive)

-11 items about factors that influence adolescents’ decision to drink

- to cope with stress (true positive); Adolescents think that alcohol goes well with fine food (false positive)

Parent-adolescent relationship

10

I spend one-on-one time with my adolescent

Never/Rarely/Sometimes/Often

Talking about alcohol

2

Have you talked to your adolescent about the risks associated with alcohol?

No/No, my child is too young to need to know this/Not sure, maybe/Yes, I have and I think they have some awareness of the risks/Yes, I have and I think they are well aware of the risks

Modelling

10

-3 assessing beliefs (1 about parental supply and 2 about parental influence)

-Giving your adolescent an occasional alcoholic drink at home will help them learn to drink responsibly

-True/False

-7 assessing behaviours

-[How often do you] get drunk at home?

- Never/Rarely/Sometimes/Often

Family rules

8

-2 assessing presence of rules (1 for general behaviour; 1 specific to alcohol)

- Have you set family rules specific to your adolescent’s use of alcohol?

Yes, definitely/Yes, partly/No, my child is too young to need rules about alcohol/No

-6 assessing the process by which family rules are established and implemented

-Do you ever compromise on family rules?

-Not applicable, we don’t have family rules/No, family rules are non-negotiable/Yes, but only on minor matters/Yes, I bend the rules to appease my adolescent

Monitoring

5

When your adolescent is not with you, do you know where they are?

Never/Sometimes/Usually/Almost always

Adolescent parties

15

[If your adolescent was to host a party for their friends, how likely would you be to] leave them alone?

Very unlikely/Unlikely/Likely/Very likely

Involvement with child’s friends and managing peer influence

6

Have you talked with your adolescent about situations where they may feel pressure from peers to drink alcohol?

No/No, my child is too young to need to know this/Not sure, maybe/Yes, I have and I think they are somewhat prepared for such situations/Yes, I have and I think they are fully prepared for such situations

Adolescent alcohol misuse

7

[Have you talked to your adolescent about] the dangers of drink driving?

Yes/No