Trial phase Antenatal screening Antenatal Enrolment and Baseline Randomisation 6 w old follow-up 6 m old follow-up 1 y old follow-up 18 m old follow-up 2 y old follow-up End Phase 1 2.5 y old follow-up 3 y old follow-up 3.5 y old follow-up 4 y old follow-up 4.5 y old follow-up 5 y old follow-up 5.5 y old follow-up First year of school follow-up (5-6 y old) 6 y old follow-up *COVID-19 Supplement (6-7 y old) End Phase 2
Year 2013-2014 2013-2014 2013-2014 2013-2014 2013-2015 2014-2015 2014-2016 2015-2016 2015-2017 2016-2017 2016-2018 2017-2018 2017-2019 2018-2019 2018-2020 2019-2021 2019-2020 2020
Impulse/emotional control P:SSIS 1 P:SSIS 1 2 T:SSIS 1 P:SSIS 1
Temperament P:ATP 3 P:ATP 3 P:ATP 3 P:ATP 3 P:ATP 3
P:TWT 4
P:ATP 3 P:ATP 3
P:TWT 4
P:ATP 3 P:ATP 3 P:ATP 3
Social values S:ATPG3

Featured measurements

ATP: Australian Temperament Project derived
ATPG3: Australian Temperament Project Generation 3 derived
SSIS: Social Skills Improvement System
TWT: Toddlers without Tears derived

Notes

1 The social skills composite only was used, which comprises of 7 subscales; communication, cooperation, assertion, responsibility, empathy, engagement, and self-control
2 Completed at half year phone interview if not completed at previous face-to-face visit
3 Single item measuring parental perception of infant/child’s temperament
4 Two questions adapted from Toddler without Tears study were used

Legend

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)