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Table 1 Lifestyle factors, risk scoring methods and risk indices derived from the 2013–2014 Australian Child and Adolescent Survey of Mental Health and Wellbeing (n = 2314)

From: Lifestyle risk indices in adolescence and their relationships to adolescent disease burden: findings from an Australian national survey

   Risk indices
Lifestyle factor Risk Scoring Method Basic risk Basic risk + BMI Basic risk + Sleep Basic risk + Smoking Basic risk + BMI + Sleep Basic risk + BMI + Smoking Basic risk + Sleep + Smoking Basic risk + BMI + Sleep + Smoking
Alcohol use 1 = 4 or more drinks on a single occasion in past month
Illicit drug use 1 = past 30-day illicit drug use
Unprotected sex 1 = no protection used against pregnancy or sexually transmitted diseases the last time respondent had sexual intercourse
BMI 1 = Body mass index < 18.5 or > 30       
Sleep 1 = < 7 h or > 11 h/day       
Smoking 1 = past 30-day cigarette smoking