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Table 1 Adolescent cancer risk behaviours and their derivation

From: Young adult cancer risk behaviours originate in adolescence: a longitudinal analysis using ALSPAC, a UK birth cohort study

Cancer risk behaviours Definition/how derived
Age 11 Age 14 Age 16 Age 18
Tobacco smoking Young person has ever smoked. Young person has smoked cigarettes in past 6 months. Young person smokes every week. Young person smokes every week.
Alcohol consumption Young person has had a whole drink before age 12 years. Young person has had whole drink in past 6 months. Young person has had 6 or more whole drinks in past 30 days. Young person consumes alcohol ≥2–3 times a week or has hazardous alcohol consumption.
Obesity Young person has a UK 1990 BMI population reference ≥95th centile. Young person has a UK 1990 BMI population reference ≥95th centile. Young person has a UK 1990 BMI population reference ≥95th centile. Young person has a UK 1990 BMI population reference ≥95th centile.
Sexual risk Young person has had penetrative sex without the use of a condom on the last occasion they had sex in the past year. Young person has had penetrative sex without the use of a condom on the last occasion they had sex in the past year. Young person has had penetrative sex without the use of a condom on the last occasion they had sex in the past year. Young person has had penetrative sex without the use of a condom on the last occasion they had sex in the past year.
Physical inactivity Young person has participated in vigorous physical activity 1–3 times a week or less (parent report). Young person typically exercises < 5 times a week (self-report) or has participated in vigorous physical activity 1–3 times a week or less (parent report). Young person typically exercises < 5 times a week (self-report) or has participated in vigorous physical activity 1–3 times a week or less (parent report). Young person typically exercises < 5 times a week (self-report) or has participated in vigorous physical activity 1–3 times a week or less (parent report).
  1. Sources of information:
  2. T1/Age 11: data from sources when the participants were aged between 128 and 154 months, the midpoint of which is 141 months or 11.75 years
  3. T2/Age 14: data from sources when the participants were aged between 166 and 171 months, the midpoint of which is 168.5 months or 14 years
  4. T3/Age 16: data from sources when the participants were aged between 186 and 200 months, the midpoint of which is 193 months or 16 years
  5. T4/Age 18: data from sources when the participants were aged between 214 and 224 months, the midpoint of which is 219 months or 18.25 years