Fig. 1
Distribution of the body shape of the patients classified by age group Thin group: body mass index (BMI) < 18.5 kg/m2; normal group: BMI 18.5–25 kg/m2 and body fat percentage < 20%; hidden obesity group: BMI ≥ 18.5 kg/m2 or < 25 kg/m2 and body fat percentage ≥ 20%; apparently obesity group: BMI ≥ 25 kg/m2 and body fat percentage < 20%; obesity group: BMI ≥ 25 kg/m2 and body fat percentage ≥ 20% BMI, body mass index