<![CDATA[Background: Age-appropriate handwashing education is important for school hygiene promotion, but the immediate knowledge gains following brief storytelling-based programs require local evaluation. This study described immediate changes in handwashing knowledge among Indonesian primary schoolchildren following a two-session educational program. Methods: A single-group pretest–posttest study included 49 third- and fourth-grade students at SD Negeri 8 Mamboro. Two 30-minute storytelling sessions with visual aids were delivered on consecutive days. Knowledge was assessed using the same 20-item questionnaire at baseline and after each session. A paired t-test estimated baseline-to-final mean change. Results: Mean knowledge scores increased from 13.35 (SD 2.08) at baseline to 17.37 (SD 1.32) after day one and 19.53 (SD 0.74) after day two. The baseline-to-final mean increase was 6.18 points (95% CI 5.61–6.76; t(48) = 21.68, p < 0.001). Conclusion: The educational program was followed by improved immediate handwashing knowledge. The uncontrolled design and short follow-up limit causal interpretation and conclusions about sustained behavior change. ]]>
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