LEP and asthma: Age and male/female ratio were not associated with the differences of leptin status between severe and mild asthma cases among overall populations (coefficient: −0.072, 95% CI: −0.208 to 0.063, p = 0.279; coefficient: 2.373, 95% CI: −0.414 to 5.161, p = 0.090) (Table 3).