“…For the age at which CP was diagnosed, 16 of the excluded studies used the same criteria as we did in this study, that is, CP diagnosis by at least 2–3 years [ 13 , 46 , 48 , 49 , 53 , 54 , 56 – 61 , 63 , 64 , 66 ]. For the method of CP diagnosis, a variety of standardized assessments were used, with the most frequent being by Amiel-Tison and Grenier [ 69 ] (5 of the 25) [ 13 , 47 , 54 , 60 , 63 ] and Touwen Infant Neurological Examination (TINE) [ 70 ] (5 of the 25) [ 46 , 47 , 49 , 54 , 64 ] with other assessments [ 71 – 81 ] detailed in Additional file 4 : Table 4.…”