Year 2007-2010 2011-2014 2011-2014 2013- 2013-
Age ~ 12 months of age 4 years 4 years 6 years 6 yrs
Wave 1 2(a) 2(b) 3(a) 3(b)
Sleep quality P:ISAAC P:ISAAC
Sleep quantity P:SDV P:SDV

Featured measurements

HBSC: Health Behaviour in School Aged Children derived
ISAAC: International Study of Asthma and Allergy in Children adaptation
PSQI: Pittsburgh Sleep Quality Index derived
SDV: Study Devised Variable


(a) – data collected for whole sample
(b) – data collected for clinic/food challenge subsample


A = Administration report abstraction
C = Index child report (reporting on others)
L = Linkage (to other databases)
M = Medical records data abstraction
O = Observation/direct assessment
N = Nurse report
P = Parent/primary caregiver report
Pe = Peer report
S = Self report
T = Teacher report
X = Undefined
X BF = Pertaining to biological father
X BM = Pertaining to biological mother
C = Pertaining to index child
X F = Pertaining to father
X Fam = Pertaining to family
X G = Pertaining to grandparent(s)
X M = Pertaining to mother
X P = Pertaining to parent(s)
X Pa = Pertaining to partner
X Pe = Pertaining to peers
X Pr = Pertaining to primary caregiver
X Si = Pertaining to sibling(s)