Nursing education is required to produce graduates with adequate clinical competency to ensure the quality and safety of healthcare services. One rapidly developing innovative learning approach is simulation-based nursing education, designed to bridge the gap between theory and clinical practice. This study aimed to analyze the effect of simulation-based nursing education on improving the clinical competency of nursing students. The study used a quasi-experimental design with a pretest-posttest approach and a control group. The study sample consisted of 80 nursing students divided into an intervention group and a control group. The intervention group received simulation-based clinical learning, while the control group underwent conventional clinical learning. Clinical competency was measured using the Objective Structured Clinical Examination (OSCE) and a standardized clinical skills instrument. Data analysis was performed using paired t-tests and independent t-tests. The results showed a significant increase in clinical competency in the intervention group compared to the control group (p < 0.001) with a strong effect size. These findings indicate that simulation-based nursing education is effective in improving clinical skills, decision-making, and student confidence. Therefore, simulation is recommended as a primary learning strategy in nursing education to enhance graduates' clinical readiness
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