TABLE 1.

Main characteristics of the groups of children involved in the study.

	Age group	Number	Sex N	Mean age and range (years;months)	WHO visual category (N per category)	Braille practice (N per level)	Tactile book reading practice (N per level)
Group with visually impaired children	3–6 years	18	10 girls 8 boys	M = 4;6 (3;1 to 5;9)	C3 = 6 C4 = 2 C5 = 11	L1 = 8 L2 = 2 L3 = 4 L5 = 4	L1 = 3 L2 = 8 L4 = 5 L5 = 2
	6–8 years	14	6 girls 8 boys	M = 6;9 (6;2 to 8;1)	C3 = 4 C4 = 2 C5 = 8	L3 = 4 L5 = 10	L1 = 2 L2 = 4 L3 = 2 L4 = 4 L5 = 2
Group with sighted children	3–6 years	20	10 girls 10 boys	M = 4;5 (3;8 to 5;11)
	6–8 years	20	14 girls 6 boys	M = 7 (6;0 to 7;11)

WHO, world health organization categories: C3, profound vision loss; C4, minimal light perception; C5, no light perception; Braille or Tactile book reading Practice: L1, no practice at all; L2, rare practice; L3, 1 or 2 times a month; L4, 1 or 2 times a week; L5, almost daily practice.