Table 2 Comparison of past medical history between the ET and NC groups
Past medical history | ET group, n (%) | NC group, n (%) | χ2 | P | Adjusted OR | 95%CI | P |
|---|---|---|---|---|---|---|---|
Any disease | 12 (3.7) | 40 (4.2) | 0.107 | 0.744 | |||
Allergy | 17 (5.3) | 29 (9.0) | 3.638 | 0.056 | |||
Infection | 5 (1.6) | 3 (0.3) | 4.193 | 0.041 | 2.226 | 0.527–2.400 | 0.276 |
Surgery | 110 (34.3) | 143 (14.8) | 57.378 | < 0.001 | 3.926 | 2.661–5.793 | < 0.001 |
Blood transfusion | 1 (0.3) | 4 (0.4) | 0 | 1 |