Table 4

Adjusted linear regression analysis for elevated (>90th centile) and normal (<90th centile) umbilical artery Doppler (UAD) pulsatility index (PI) for validated British Ability Scales II General Conceptual Ability Score (GCA) scale parameters at 28, 34 and 38 weeks, respectively, expressed as mean and SD

GCA scaleWeek 28 (1.73 threshold)Week 34 (1.28 threshold)Week 38 (1.17 threshold)
NormalElevatedp ValueNormalElevatedp ValueNormalElevatedp Value
Verbal sums of scores,
mean (SD)
103.5 (1.6)99.3 (2.6)0.186102.6 (1.5)101.5 (4.3)0.810102.2 (1.6)102.1 (5.0)0.985
Non-verbal reasoning sums of scores,
mean (SD)
97.5 (1.5)93.9 (2.5)0.23096.0 (1.4)99.9 (4.1)0.36396.0 (1.5)94.5 (4.8)0.766
Spatial sums of scores,
mean (SD)
100.1 (1.4)97.7 (2.4)0.41799.5 (1.4)100.3 (4.0)0.84697.9 (1.4)110.3 (4.4)0.008
Standard verbal ability scores,
mean (SD)
102.7 (1.2)99.5 (2.1)0.193102.0 (1.2)101.1 (3.4)0.803101.7 (1.3)101.8 (4.0)0.978
Standard non-verbal reasoning ability,
mean (SD)
97.7 (1.3)94.7 (2.1)0.23896.4 (1.2)99.6 (3.4)0.37096.4 (1.3)95.2 (4.0)0.768
Standard spatial ability,
mean (SD)
99.5 (1.3)97.4 (2.1)0.40998.9 (1.2)99.6 (3.5)0.84597.6 (1.2)108.6 (3.9)0.008
Standard GCA,
mean (SD)
99.9 (1.3)96.4 (2.1)0.17598.8 (1.2)100.1 (3.5)0.73798.2 (1.3)101.9 (4.0)0.385