Year 2011-2015 2011-2015
Wave Whole cohort Clinical sub-sample
Age 10-14 years 10-14 years
Smoking parents P:SDV/ECRHS II/ISAAC

S – self report
P – parent report
C – child report
T – teacher report
N – welfare nurse
O – observation

M: Mother
F/P: Father/Partner
C: Child
S: Sibling
G: Grandparent

SDV: Study Devised Variable
ECRHS II: Second European Community Respiratory Health Survey derived
ISAAC: International Study of Asthma and Allergy in Children adaptation