Table 2.
Means and standard deviation (SD) of PI and SV of uterine, umbilical, and middle cerebral artery in cohort of a low risk pregnant women.
| GA (weeks) | N | Uterine artery | Umbilical artery | Middle cerebral artery | |||
|---|---|---|---|---|---|---|---|
| PI (±SD) | SV cm/s (±SD) | PI (±SD) | SV cm/s (±SD) | PI (±SD) | SV cm/s (±SD) | ||
| 16–19 | 63 | 1.16 (±0.37) | 244.91 (±949.99) | 1.43 (±0.24) | 26.61 (±5.60) | 1.70 (±0.28) | 21.78 (±4.40) |
| 20–23 | 63 | 0.93 (±0.24) | 89.69 (±32.44) | 1.24 (±0.14) | 29.52 (±7.08) | 1.81 (±0.36) | 22.93 (±5.05) |
| 24–27 | 63 | 0.85 (±0.20) | 94.28 (±31.74) | 1.08 (±0.17) | 35.64 (±8.73) | 2.14 (±0.71) | 28.36 (±6.36) |
| 28–31 | 63 | 0.77 (±0.20) | 97.36 (±26.05) | 1.03 (±0.15) | 39.36 (±8.03) | 2.14 (±0.41) | 38.42 (±7.99) |
| 32–35 | 63 | 0.80 (±0.35) | 149.93 (±277.64) | 0.93 (±0.24) | 44.20 (±9.65) | 2.18 (±0.44) | 49.22 (±9.81) |
| 36-37 | 53 | 0.73 (±0.23) | 96.13 (±26.79) | 0.85 (±0.20) | 44.44 (±11.10) | 1.79 (±0.45) | 53.24 (±13.56) |
| 38-39 | 29 | 0.71 (±0.20) | 104.41 (±28.35) | 0.79 (±0.12) | 45.40 (±9.26) | 1.72 (±0.32) | 52.98 (±13.54) |
| 40-41 | 14 | 0.90 (±0.30) | 84.84 (±30.23) | 0.81 (±0.15) | 44.85 (±10.87) | 1.74 (±0.39) | 61.25 (±19.19) |
GA, gestational age; SV, systolic velocity; PI, pulsatility index; SD, standard deviation.