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Circumference was measured twice; if the measurements differed by >1 cm, a third measurement was made.
Before 27 weeks gestation, Scott's method and Hadlock's method to estimate fetal weight from ultrasound measurements differed by only 10 g, whereas the difference between estimates obtained from Scott's method and the model for optimal weight derived from birth weight measurements was almost 200 g.
33 34 Length A research assistant took two measurements of length with the child in a supine position on a level floor (with a SECA 210 Infant Measuring Mat, Hamburg, Germany) and recorded it to the nearest 0.1 cm; a third measure was taken if the first two measurements differed by 0.5 cm or more, and the mean of these two or three values was calculated.
If measurements differed by >10%, the cardiac output was measured two more times and a mean was calculated after exclusion of the highest and lowest values.
The results of these measurements differed by less than 2% from those reported in the literature.
The influence of one outlier (patient no. 23 in whom the two measurements differed by 6 g/ml) was clearly visible as SD = 1.415 with N = 23 exceeded SD = 1.060 at the end of the study (N = 45).
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Arch_length measured with Ortho Insight 3D showed the greatest method error, with differences between replicate measurements differing by ±0.48 mm 95%% of the time.
In cases where two measurements differ by more than 1.0 mm, the skin fold is measured a fourth time and the mean value of the four values is averaged.
Clinically significant variability was assessed with intraclass correlation coefficients (ICCs) and the percentage of pairwise measurements differing by ≥0.5 mm.
Furthermore, estimates of diffusing capacity and capillary blood volume obtained through stereological and DLCO-based measurements differ by a factor of two or more [6], [7].
A third skinfold measurement will be taken if the first two measurements differ by more than 1.0 mm.
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