Answer: C. 50%. A recent study of >600 000 Israeli adolescents, published in the Journal of the American Academy of Dermatology, found that severely obese (BMI ≥35 kg/m2) adolescents had 50% decreased odds of acne vs those with a normal BMI. Obese adolescents (BMI, 27.5-32.49 kg/m2) had 35% decreased odds of acne and overweight adolescents (BMI, 22-27.49 kg/m2) had 20% decreased odds of acne vs those with normal weight.
4. According to the same study, for each 1-unit increase in BMI, male adolescents had a greater decrease in adjusted odds ratio (aOR) of acne vs female adolescents.