MX1 and asthma: Classifying the 48 subjects into either mold-sensitized (sIgE to mx1 ≥ 0.35 kUA/L) subjects (n = 12) or non-mold-sensitized (sIgE to mx1 < 0.35 kUA/L) subjects (n = 36) showed that respiratory symptoms, including asthma, predominated in the mold-sensitized (mx1-positive) group.