Effect of health instructions on thalassemic adolescents’ total knowledge items score.

Table 2: Effect of health instructions on thalassemic adolescents’ total knowledge items score.

Knowledge about blood and blood components
Satisfactory	1		2.0			49	98.0		29		58.0		72.840^**
Unsatisfactory	49		98.0			1	2.0		21		42.0
Knowledge about the disease
Satisfactory	2		4.0			50	100.0		47		94.0
Unsatisfactory	48		96.0			0	0.0		3		6.0		92.367^**
Knowledge about disease’s complications
Satisfactory	0		0.0			50	100.0		45		90.0
Unsatisfactory	50		100.0			0	0.0		5		10.0		91.000^**
Knowledge about diet and premarital genetic counseling
Satisfactory		21		42.0	50			100.0		49		98.0
Unsatisfactory		29		58.0	0			0.0		1		2.0		56.069^**
Knowledge about chelation therapy and iron chelating agents
Satisfactory		1		2.0	49			98.0		17		34.0
Unsatisfactory		49		98.0	1			2.0		33		66.0		75.796^**