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
Attention O:NFICAT O:NFICAT
Executive function O:NFICAT O:NFICAT T:CHEXI P:CHEXI
Play/object use P:CSBS-DP-ITC 1
Language P:SDV 2
O:SDV 3
P:CSBS-DP-ITC 1
O:SDV 3
O:CELF-P2 4 O:CELF-P2 4
O:SEAPART
O:CELF-P2 4
O:SEAPART
T:LSAC 5
Gestures P:CSBS-DP-ITC 1

Featured measurements

CDI-WG: MacArthur-Bates Communicative Development Inventories (Words and Gestures)
CELF-P2: Clinical Evaluation of Language Fundamentals Preschool - Second Edition, Australian and New Zealand Standardised Edition
CHEXI: Childhood Executive Functioning Inventory
CSBS-DP-ITC: Communication and Symbolic Behavior Scales Developmental Profile Infant-Toddler Checklist
ELVS: Early Language in Victoria Study derived
LSAC: Longitudinal Study of Australian Children derived
NFICAT: National Institutes of Health (NIH) Toolbox Flanker Inhibitory Control and Attention Test
SDV: Study Devised Variable
SEAPART: School Entry Alphabetic and Phonological Awareness Readiness Test - Standardised Scoring

Notes

1 6 items from the CSBS-DP-ITC were used
2 Study-devised 8-item language module, drawing from ELVS, CDI-WG and CSBS-DP-ITC
3 5 minute videos of unstructured play were analysed to measure maternal-child interactions (maternal responsive behaviours). Technique adapted from: Levickis, P., Reilly, S., Girolametto, L., Ukoumunne, O.C. and Wake, M. (2014). Maternal behaviors promoting language acquisition in slow-to-talk toddlers: prospective community-based study. J Dev Behav Pediatr, 35(4): 374-81. doi:10.1097/DBP.0000000000000056
4 The Sentence Structure, Word Structure, and Expressive Vocabulary subtests were used
5 A single global item was asked about language and literacy skills

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)