The boxplot of fitted behavior problem score among children with different risk factors (i.e. neither physical abuse nor non-anemic iron deficiency, physical abuse only, non-anemic iron deficiency only and both physical abuse and non-anemic iron deficiency). The fitted YSR scores were adjusted by child sex, age, socioeconomic status, family location, hemoglobin level and body mass index (BMI). NA, non-anemic. YSR, Youth Self Report.