Table 1.
Structured questionnaire containing anagraphic, anamnestic, clinical, and biochemical variables considered as independent variables (input)
| Variables | Independent variables (input) levels |
| 1. Sex (2) | Male; female |
| 2. Age1 | |
| 3. Referred from the Department of… (5) | Hematology, gastroenterology, dermatology, endocrinology, other |
| 4. Presentation symptom (5) | Anemia, GI symptoms/disorders, dermatological symptoms/disorders, endocrinological symptoms/disorders, other |
| 5. Onset of presentation symptom (mo) | |
| 6. GI symptoms (4) | Dyspepsia motility-like, dyspepsia ulcer-like, other GI symptoms, absence |
| 7. Neurological symptoms (2) | Yes/no |
| 8. Other symptoms (2) | Yes/no |
| 9. Family history (1st degree relatives) autoimmune diseases (2) | Yes/no |
| 10. Family history (1st degree relatives) for gastric neoplasms (2) | Yes/no |
| 11. Family history (1st degree relatives) for duodenal ulcer or gastric ulcer (3) | No family history, family history for duodenal ulcer, family history for gastric ulcer |
| 12. Association with thyroid disease (2) | Yes/no |
| 13. Association with dermatological disease (2) | Yes/no |
| 14. Association with neoplasms (2) | Yes/no |
| 15. Association with duodenal ulcer or gastric ulcer (2) | Yes/no |
| 16. Association with other diseases not mentioned previously (2) | Yes/no |
| 17. Anemia (3) | No anemia, macrocytic (pernicious) anemia, microcytic (iron-deficiency) anemia |
| 18. Hemoglobin1 | |
| 19. Mean corpuscular volume (MCV1) | |
| 20. Fasting gastrin1 | |
| 21. Pepsinogen I1 | |
| 22. Parietal cell antibodies (2) | Presence/absence |
GI, gastrointestinal; ABG, atrophic body gastritis;
1
continuous variables.The number of levels of each variable is indicated in the brackets.