2.3. N-Gain Nilai Value Analysis
N-gain is the comparison of the average gain obtained with the maximum possible average (Gain = posttest score – pretest score). The benefit of N-gain is to see the impact of providing education or learning. The equation used in calculating the N-gain is as follows:
Equation  1. N-Gain
Table 1 is a classification table for N-gain in percentage by Anshori and Wulandari (2020):
Table 1. N-Gain Classification Table
3. Results and Discussion
Table 2 is the result of the analysis of the paired t-test which shows the average pretest value is 65.00 and the posttest average value is 83.33. These results indicate an increase in knowledge of the students of Tunas Karya Elementary School after being given treatment about the importance of protein nutrition education for the body.
Table 2. Improved Test Paired Sample t-Test
Table 3 is the result of the analysis of the paired t-test which shows the significant value of the pretest and posttest. The effectiveness of giving treatment in the form of education about the importance of protein nutritional intake for the body is significant based on the results of the t-test because it is based on Table 3. sig. (2-tailed) between pretest and posttest has a value of 0.001 <0.05 which means there is a significant increase.
Table 3. Significant Test t-Test
Table 4 is the result of the analysis of the gain value which is processed using excel. The calculation of the gain value is done to see the increase in students' knowledge after being given treatment in the form of socialization and education about the importance of protein nutrition for the body. From Table 4 it is known the average value of N-gain is 0.51 (51%) indicating the treatment given in the form of socialization and education about the importance of protein nutrition for the body is less effective for elementary school students. This is in accordance with research conducted by Anshori and Wulandari (2020) if the percentage value is at least 40% and a maximum of 55%, then the method is less effective. This is caused by a lack of knowledge from students when only given one treatment.
