Assessing and Improving the Knowledge of Sexually Transmitted Infections among High School Adolescents

Table 3

Participant group scores before and after STI presentation.

Participant groups	n	Pretest score		Posttest score		Mean diff	SD of mean diff	value
		Mean	SD	Mean	SD
Grade 11	57	1.09	0.79	3.11	1.62	2.02	1.65	<0.0001
Grade 12	16	1	0.63	2.25	1.34	1.25	1.18	0.0007
All participants	74	1.07	0.75	2.92	1.59	1.85	1.58	<0.0001