Table 2

Median serum levels (with interquartile ranges) of nutrients in the three study groups

NutrientNormal rangeBrittle asthmaNon-brittle asthmaHealthy adults
Mg0.6–1.0 mmol/l0.9  (0.8–0.9)0.9  (0.8–0.9)0.9  (0.9–1.0)
Se0.89–1.65 μmol/l1.0 (0.8–1.2)1.0 (1.0–1.2)1.1 (1.0–1.2)
Vitamin A0.7–1.5 μmol/l2.8 (2.2–3.2)2.7 (2.3–3.3)2.6 (2.2–2.8)
Vitamin C26–86 μmol/l35.1 (24.7–64.0)56.9 (46.8–63.3)49.6 (32.3–63.8)
Vitamin E11.5–24.4 μmol/l31.8 (29.3–35.4)29.8 (24.4–34.3)28.8 (26.3–31.50)