Table 2.
Relative risk of indicators of placental insufficiency when a 20–36-week EFW and AC growth velocity cut-off of < − 30 centiles is used to dichotomise the cohort
| Growth parameter | Low growth velocity n (%) | Growth velocity not low n (%) | RR (95% CI) if low 20–36-week growth velocity of < − 30 centiles | P | |
|---|---|---|---|---|---|
| CPR < 5th centile [12] | EFW | 11/65 (16.9) | 18/237 (7.6) | 2.23 (1.11–4.36) | 0.03 |
| Umbilical artery pH < 7.15 at birth | EFW | 9/48 (18.8) | 15/190 (7.9) | 2.38 (1.11–4.93) | 0.03 |
| AC | 5/18 (27.8) | 19/220 (8.6) | 3.22 (1.32–6.93) | 0.02 | |
| ADP low body fat percentage [13] | AC | 1/9 (11.1) | 11/127 (8.7) | 1.28 (0.22–5.87) | 0.58 |
| Placental weight < 10th centile [21] | EFW | 27/61 (44.3) | 36/216 (16.7) | 2.66 (1.75–3.96) | < 0.0001 |
| AC | 10/22 (45.5) | 53/255 (20.8) | 2.19 (1.24–3.44) | 0.01 |
RR relative risk, CI confidence interval, EFW estimated fetal weight, AC abdominal circumference, CPR cerebroplacental ratio, ADP air displacement plethysmography