Adjusted linear or logistic regression analysis for elevated (>90th centile) and normal (<90th centile) umbilical artery Doppler (UAD) pulsatility index (PI) for validated British Ability Scales II diagnostic scale parameters at 28, 34 and 38 weeks expressed as mean and SDs (SD).
| Week 28 (1.73 threshold) | Week 34 (1.28 threshold) | Week 38 (1.17 threshold) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Diagnostic scale | Normal | Elevated | p Value | Normal | Elevated | p Value | Normal | Elevated | p Value |
| Recall of objects immediate verbal, mean (SD) | 142.9 (1.9) | 130.7 (3.3) | 0.002 | 140.5 (1.8) | 136.1 (5.3) | 0.438 | 139.7 (2.0) | 130.3 (6.2) | 0.151 |
| Recall of objects immediate spatial,* mean (SD) | 0.48 (0.07) | 0.69 (0.05) | 0.016 | 0.53 (0.04) | 0.58 (0.12) | 0.731 | 0.59 (0.05) | 0.46 (0.13) | 0.380 |
| Recall of objects delayed verbal, mean (SD) | 15.6 (0.25) | 14.3 (0.43) | 0.008 | 15.3 (0.2) | 14.6 (0.7) | 0.298 | 15.1 (0.2) | 14.1 (0.8) | 0.206 |
| Recall of objects delayed spatial,* mean (SD) | 0.52 (0.05) | 0.67 (0.07) | 0.108 | 0.55 (0.04) | 0.64 (0.12) | 0.530 | 0.62 (0.04) | 0.55 (0.13) | 0.604 |
| Speed of information processing—ability score, mean (SD) | 163.2 (3.1) | 157.9 (5.2) | 0.389 | 163.0 (2.7) | 154.6 (8.0) | 0.323 | 160.0 (3.0) | 163.1 (9.3) | 0.750 |
| Recall of digits forward—ability score, mean (SD) | 151.5 (1.8) | 150.4 (3.0) | 0.761 | 150.9 (1.6) | 150.1 (4.7) | 0.872 | 150.7 (1.8) | 150.2 (5.7) | 0.941 |
| Recall of pictures—ability score, mean (SD) | 123.8 (1.2) | 120.7 (2.1) | 0.209 | 122.8 (1.1) | 123.9 (3.3) | 0.752 | 121.3 (1.3) | 130.3 (3.9) | 0.030 |
| Recall of digits backwards—ability score, mean (SD) | 129.8 (1.7) | 124.1 (2.8) | 0.087 | 128.6 (1.5) | 126.4 (4.4) | 0.634 | 128.6 (1.7) | 125.4 (5.3) | 0.564 |
*Logistic regression, mean in these cases refers to the odds of an abnormal (low) recall score for a child at the mean age (12.1 years) with a mean Townsend score (1.79).