Table I.
Changes in DAO levels in all patients and controls before, during, and after challenge with histamine each meal
| Study subject | Reported atopic disease | DAO level before meal (U/mL) | DAO level after meal (U/mL) | Change in DAO level after meal (1 = rise; 2 = reduction; 0 = no difference) | Any symptoms after meal (1= yes; 2 = no) |
|---|---|---|---|---|---|
| Patient 1 | Asthma | 10.9 | 10.5 | 2 | 1 |
| Patient 2 | — | 4.8 | 4.4 | 2 | 1 |
| Patient 3 | — | 3.3 | 3.4 | 1 | 1 |
| Patient 4 | — | 1.6 | 1.8 | 1 | 1 |
| Patient 5 | Asthma | 4.1 | 4.2 | 1 | 2 |
| Patient 6 | — | 4.6 | 4.4 | 2 | 1 |
| Patient 7 | — | 4.1 | 5.0 | 1 | 1 |
| Control 1 | — | 14.2 | 15.1 | 1 | 2 |
| Control 2 | — | 13.8 | 14.7 | 1 | 2 |
| Control 3 | — | 7.3 | 11.3 | 1 | 2 |
| Control 4 | — | 29.6 | 24.0 | 2 | 1 |
| Control 5 | — | 15.1 | 13.6 | 2 | 2 |
| Control 6 | — | 11.3 | 13.8 | 1 | 2 |
| Control 7 | — | 16.9 | 17.6 | 1 | 2 |
| Control 8 | — | 7.8 | 10.0 | 1 | 2 |
| Control 9 | — | 5.1 | 4.9 | 2 | 2 |
| Control 10 | — | 16.7 | 16.7 | 0 | 2 |