Table 3. The estimation of factors affecting MP using Linear Mixed Models.

Factors	MP (GMFCS level I-III)			MP (GMFCS level IV)			MP (GMFCS level V)
	Estimation	SE	P value	Estimation	SE	P value	Estimation	SE	P value
Intercept	27.3	1.5	< 0.001	45.5	4.0	< 0.001	51.7	5.0	< 0.001
Follow up	0.34	0.09	< 0.001	1.9	0.4	< 0.001	6.2	1.5	< 0.001
Sex	-3.3	1.6	0.048	-8.9	4.2	0.037	4.6	5.4	0.396

MP, migration percentage; GMFCS, gross motor function classification system; SE, standard error.