Table 6 OHSS events and severity
|  | Study group (N = 1783) | Control group (N = 1419) |
|---|---|---|
OHSS events, n (%) P-valuea | 27 (1.5) | 57 (4.0) P < 0.0001 |
OHSS severity, n (%) Mild/Grade I Moderate/Grade II Severe/Grade III | 12 (0.7) 13 (0.7) 2 (0.1) | 32 (2.3) 20 (1.4) 5 (0.4) |