. Author manuscript; available in PMC: 2014 Oct 1.

Published in final edited form as: Early Hum Dev. 2013 Jul 29;89(10):10.1016/j.earlhumdev.2013.07.002. doi: 10.1016/j.earlhumdev.2013.07.002

Table 2.

Gestational Age-Adjusted IUGR–LR Difference in HRV measures

	When Heart-Rate Pattern=A				When Heart-Rate Pattern=B

HRV measure	Estimated Difference¹	Standard Error²	P³	IUGR/LR Ratio⁴	Estimated Difference¹	Standard Error²	P³	IUGR/LR Ratio⁴
PPA	−0.6504	0.3073	0.0415	0.637	−1.0622	0.4059	0.013	0.479
RMSSD	−0.2639	0.1541	0.0956	0.833	−0.2401	0.2035	0.2461	0.847
SDNN	−0.3039	0.205	0.1472	0.81	−0.9682	0.2708	0.001	0.511

Estimated IUGR–LR difference in log₂-transformed HRV measure, adjusted for gestational age (GA).

Standard error of the estimated difference.

Two-tailed P value testing the estimated difference, based on Student’s t-distribution with 35 degrees of freedom.

⁴

GA-adjusted IUGR/LR ratio of HRV measure in original units, obtained by reverse-transformation (i.e. base-2 exponentiation) of the estimated difference.