(A) Gross motor function—task specific vs alternative: standing ability (Gross Motor Function Measure (GMFM) domain D) at T1. (A) Gross motor function—task specific vs alternative: standing ability (Gross Motor Function Measure (GMFM) domain D) at T1. (B) Gross motor function—task specific vs alternative: standing ability (GMFM domain D) at T2. (C) Gross motor function—task specific vs alternative: walking, running and jumping ability (GMFM domain E) at T1. (D) Gross motor function—task specific vs alternative: walking, running and jumping ability (GMFM domain E) at T2. (E) Gross motor function—task specific vs alternative: overall GMFM score at T1. (F) Gross motor function—task specific vs alternative: overall GMFM score at T2. Rachel Toovey et al. bmjpo 2017;1:e000078 © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.