Onset of lid akinesia	G I		G II		G III		G IV		X²	P-value
Onset of lid akinesia	N	%	N	%	N	%	N	%	X²	P-value
1 m	0	0	5	16.7	3	10	0	0	9.643	0.022*
3 m	0	0	11	36.7	27	90	0	0	75.332	0.001*
5 m	15	50	14	46.7	0	0	28	93.3	52.503	0.001*
8 m	15	50	0	0	0	0	2	6.7	42.792	0.001*