| http://www.w3.org/ns/prov#value | - The potential influence of the school environment was assessed by asking: ???Is there a school rule against tobacco in your school???? The response options provided were ???There is no official/written rule???, ???There is a rule, but it is not enforced???, ???There is a rule, but it is only sometimes enforced??? or ???There is a rule and it is strictly enforced???.
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