Analysis: For the primary aim the prevalence of motor impairment from birth to 5 years will be compared between children born <30 weeks and term-born peers using the proportion of children classified as abnormal at each of the time points (term age, one, two and five years). Persistent motor impairments during the neonatal period will be assessed as a predictor of severity of motor impairment at 5 years of age in children born <30 weeks using linear regression. Models will be fitted using generalised estimating equations with results reported using robust standard errors, to allow for the clustering of multiple births.