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Maternal contribution to ultrasound fetal measurements at mid‑pregnancy
Abstract
Background: Maternal variables are known contributors to fetal variables and can be assessed during pregnancy.
Objective: To assess maternal contribution to some mid‑pregnancy fetal ultrasound measurements.
Materials and Methods: A prospective study involving 87 pregnant women scanned at 18–23 weeks of pregnancy was carried out. The fetal measurements were head circumference (HC), abdominal circumference (AC), femur length (FL), and biparietal diameter (BPD) while the maternal variables were age, parity, height, weight, and BMI.
Results: There were intercorrelations between some maternal and fetal variables respectively. Parity correlated significantly with all the ultrasound fetal measurements (P <.05), but the association vanished with partial correlation (P >.05). Significant correlation between parity and age remained the same with simple and partial correlations (P < 0.01). Canonical correlation analysis gave four sets of canonical variables; however, none was statistically significant. Regressing fetal parameters against parity through parent‑fetus regression procedure gave significant model fit (P < 0.05), but low r2 value suggesting that variations in parity did not explain much of the variations observed in the fetal ultrasound measurements (3.9% < r2 < 6.7%). The generated models revealed HC having the highest standardized regression coefficient (b = 5.07; P <.05) while FL had the least (b = 1.08; P <.05).
Conclusion: The results suggested that parity contributed significantly to fetal ultrasound measurements at mid‑pregnancy while maternal height, weight, and BMI made no significant impact.
Key words: Correlation; fetal; maternal; regression; ultrasound scan.
