Comparison of ophthalmic artery Doppler velocimetry parameters between preeclampsia cases and controls
| Variable | Cases (n=71) Mean (SD) | Controls (n=72) Mean (SD) | t-test | P value |
| Pulsatility index | 1.35 (0.46) | 2.10 (0.40) | 10.24 | <0.001 |
| Resistivity index | 0.70 (0.18) | 0.83 (0.27) | 3.25 | 0.001 |
| Peak systolic velocity (cm/s) | 18.2 (5.5) | 26.4 (6.4) | 8.14 | <0.001 |
| Peak ratio | 3.3 (0.9) | 6.0 (1.1) | 16.64 | <0.001 |
| End-diastolic velocity (cm/s) | 5.6 (2.1) | 5.4 (1.8) | 0.62 | 0.535 |
cm/s, centimetre per second.