Year 2011-2015 2011-2015
Wave Whole cohort Clinical sub-sample
Age 10-14 years 10-14 years
Animal exposure P:HN
S – self report
P – parent report
C – child report
T – teacher report
N – welfare nurse
O – observation

XM: Mother
XF/P: Father/partner
XC: Child
XS: Sibling
XG: GrandparentSDV: Study Devised Variable
ECRHS II: Second European Community Respiratory Health Survey derived
HN: HealthNuts Study derived
ISAAC: International Study of Asthma and Allergy in Children adaptation