18 Table 3.28: Comparison of the students' score of taking previous history skill after 9-week intervention and 2-year intervention Score of taking previous history skill After 9 weeks intervention After 2 years intervention Difference p Intervention group (n=93) 56, 45±13, 05 68, 05±11, 07 11, 6 < 0, 001 Control group (n=94) 53, 01 ±12, 01 60, 17±10, 03 7, 16 < 0, 01 Difference 3, 44 7, 88 p > 0, 05 <0, 001 Comment: The difference in score after 9 weeks, after two years of intervention in the intervention group increased 11.6 points, in the control group is only 7.16 points, the difference is statistically significant.