Table 4.

DAO-activity (U/mL) among subjects reporting symptoms from histamine rich foods.

Symptoms from Histamine Rich Foods	Median DAO U/mL (IQR)	p-Value *
Gastrointestinal	11..4 (13.0)	0.6
Dermatological	14.3 (14.0)	0.197
Airway	9.6 (8.0)	0.215
Neurological	14.0 (7.5)	0.423
Any of above	11.9 (12.3)	0.215
None	11.2 (11.5)	n/a

* Mann–Whitney U-test was used for reporting symptoms from histamine rich foods compared with the group not reporting symptoms from histamine rich foods.