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OBJECTIVE To identify the effect of health education using video on mother's knowledge and attitudes about behavior problems among preschool children. METHODS This research was a quasi-experimental study with a pre-test-post-test control group design. The sampling technique was purposive sampling, and it was divided into an intervention group (n=61) and control group (n=61). The intervention group was given intervention using a two-dimensional animated video, while the control group used leaflets. Knowledge and attitudes of the mother w