This study was conducted to identify risk factors that influence the probability and severity of unhealthy weight control behaviors (UWCBs) and to consider gender difference. Data were obtained from a national survey. The study population was composed of 66,068 adolescents in grades 7–12 at 400 middle schools. The effect of the independent variables on UWCBs was analyzed using zero inflated negative binominal regression. Higher body mass index group, overweight perception, appearance stress, and depressive mood were found to be risk factors of UWCBs’ probability in both genders. For boys, older age, underweight, accurate or under-perception of weight, and depressive mood influenced severity of UWCBs. For girls, older age, appearance stress, and depressive mood influenced severity of UWCBs. The new findings mean to consider the range of UWCBs experienced, which can offer more sensitive and predictable information. Further interventions should be developed to consider gender specific risk factors.
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