. Author manuscript; available in PMC: 2012 Mar 1.

Published in final edited form as: Neurotoxicol Teratol. 2010 Oct 8;33(2):212–219. doi: 10.1016/j.ntt.2010.10.001

Table 3.

Associations (i.e., Main Effects) for Childhood Pb Levels and Children’s Baseline Physiological Functioning.

Hemodynamic Measures	N²	Pb Quartile¹				p value for Linear Trend Across Quartiles	Partial r
Hemodynamic Measures	N²	1	2	3	4	p value for Linear Trend Across Quartiles	Partial r
Systolic blood pressure (mmHg)	139	106.10	102.60	107.34	102.47	0.51	0.02
Diastolic blood pressure (mmHg)	139	56.14	54.28	56.97	53.42	0.36	−0.09
Heart rate (beats/minute)	140	82.47	83.24	83.69	78.55	0.16	−0.20 ^τ
Pre-ejection period (msec)	140	107.75	108.39	105.17	104.45	0.11	−0.13
HF HRV (ms²)	95	5775.77	5237.09	5014.43	8798.16	0.12	0.16
CAR (HFz + ( – PEPz))	95	0.00	−0.09	0.07	0.85	0.07	0.23^*
CAB (HFz − ( – PEPz))	95	0.27	0.17	−0.06	0.47	0.80	0.05

^τ

p < .10;

p < .05

For quartiles, the ranges (in μg/dL) for Pb were: 0.14 – 0.68 μg/dL (1^st quartile), 0.69 – 0.93 μg/dL (2^nd quartile), 0.94 – 1.20 μg/dL (3^rd quartile), and 1.21 – 3.76 μg/dL (4^th quartile).

Sample size varied across outcomes for reasons outlined in the methods section.