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. 2021 Mar 16;6(3):e004307. doi: 10.1136/bmjgh-2020-004307

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Adjusted mean differences in age-standardised Ages and Stages Questionnaire Inventory (ASQi) and Communicative Development Inventory (CDI), by intervention arm. Results for all domains are internally age-standardised to the control arm, points represent mean differences in standardised scores between each intervention arm and the control arm, lines represent 95% CIs. n by domain, after removing outliers and missing data: ASQi communication, n=566; ASQi fine motor, n=559; ASQi gross motor, n=563; ASQi problem-solving, n=563; ASQi personal social, n=550; ASQi total, n=532; CDI receptive n=573; CDI expressive n=498 (only including children over 9 months old).