Perbedaan perubahan pengetahuan anemia pada remaja putri setelah edukasi Hemo-Jenga berbasis Emotional Demonstration: studi kuasi-eksperimental

Background: Anemia remains a nutritional problem among adolescent girls. In 2025, screening in the Gladakpakem Health Center area identified anemia in 167 of 358 girls (46.65%). Previous studies examined games and Emotional Demonstration separately. Hemo-Jenga addresses this gap by integrating Jenga mechanics, Emotional Demonstration, and block-based visualization of hemoglobin and iron stores.Objectives: To assess changes in anemia knowledge among adolescent girls after education using Hemo-Jenga with the Emotional Demonstration method at Kartini Vocational High School, Jember.Methods: This quasi-experimental study with a non-equivalent control group included 60 of 150 students selected through proportional quota sampling. Groups were allocated nonrandomly by grade, with grade X as the intervention group and grade XI as the control group. Knowledge was assessed at pretest and immediately after the intervention on the same day. Change scores were compared using the Mann–Whitney U test. Effect size r and N-Gain were also calculated.Results: At baseline, no statistically significant difference in knowledge scores was detected (p = 0.148). Mean changes were 7.03 (95% CI 5.83–8.23) in the intervention group and −0.13 (95% CI −0.74–0.47) in the control group. Median changes were 6.00 (IQR 5.00) and −0.50 (IQR 2.00), respectively. Change scores differed between groups (U = 3.00, p < 0.001, r = 0.86). N-Gain was 66.36% (moderate) in the intervention group and −1.77%, indicating no improvement, in the control group.Conclusion: The intervention group showed a greater immediate improvement in knowledge scores. These short-term findings should be interpreted cautiously because group allocation was nonrandom and grade-based.