| Adverse Events | Ruxolitinib (n = 54) | Hydroxycarbamide (n = 56) | Odds Ratio (95% CI) | P value |
| Headache | 9 | 3 | 3.53 (0.90 - 13.8) | 0.035 |
| Pruritus | 6 | 6 | 1.04 (0.31 - 3.45) | 0.473 |
| Fatigue | 11 | 6 | 2.13 (0.73 - 6.24) | 0.084 |
| Diarrhea | 5 | 11 | 0.42 (0.14 - 1.30) | 0.065 |
| Anemia | 20 | 13 | 1.95 (0.85 - 4.47) | 0.058 |
| Thrombocytopenia | 5 | 15 | 0.28 (0.09 - 0.84) | 0.011 |