Table 2: Relations among the risk factors of medical records related to IgG (National Basic Health Research 2007).

Medical record variableSerological status (IgG)OR95% CI
Negative (%)Positive (%)

(a) Dental treatment
 (1) Yes840 (97.7)20 (2.3)2.26(0.98–5.2)0.050
 (2) No1096 (97.8)24 (2.2)
(b) Thalassemia
 (1) Yes31 (100.0)0 (0.0)1.02(1.02–1.03)0.407
 (2) No21925 (97.8)486 (2.2)
(c) Hemophilia
 (1) Yes26 (96.3)1 (3.7)0.58(0.08–4.31)0.593
 (2) No11190 (97.8)251 (2.2)
(d) Blood transfusion
 (1) Yes1881 (98.0)39 (2.0)1.15(0.79–1.66)0.455
 (2) No4780 (97.7)114 (2.3)