Wave W1 W2 W3 W4 W5 W6
Time of collection Up to 12 weeks gest 13 to 24 weeks gest 25 weeks to birth Birth 18 mths 6 yrs
Year 2007-2009 2007-2009 2007-2009 2007-2009 2008-2011 2014-2016
Birth weight P:SDVM F P:SDVC
Birth length P:SDVC
Birth head circumference P:SDVC
Gestational age P:SDVM F P:SDVC
Mode of delivery P:SDVM
Multiple births P:SDVM F  P:SDVC
Labour  P:SDVM
Dates and times of birth  P:SDVC
Intensive care  P:SDVC
Placental examination (weight, cord insertion, chorionicity) P:SDVC
Twin status (zygosity, chorionicity, amnionicity) P:SDVC


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)