. 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 4.

Associations of Blood Pb and Children’s Cardiovascular Reactivity to Acute Stress (controlling for all covariates).

Hemodynamic Measures	N²	Pb Quartile ¹				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	5.30	7.33	7.07	7.23	0.31	0.12
Diastolic blood pressure (mmHg)	139	4.02	5.64	5.09	5.53	0.29	0.17 ^τ
Heart rate (beats/minute)	140	0.91	0.19	0.86	0.58	0.85	−0.01
Stroke volume (% change)	140	2.23	0.91	−3.47	−0.89	0.04	−0.16 ^τ
Cardiac output (% change)	140	3.26	1.19	−2.31	−0.20	0.05	−0.15 ^τ
Total peripheral resistance (% change)	139	2.91	8.18	9.55	9.51	0.03	0.20^*

^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.