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. Author manuscript; available in PMC: 2010 Jul 1.

Published in final edited form as: Neurotoxicol Teratol. 2009 Feb 27;31(4):216–224. doi: 10.1016/j.ntt.2009.02.002

Table 5.

ABER Wave Latency¹ in Different Smoking Groups (N=172)

	Smoking Group
	Control	Light (<10/day)	Moderate (10 to 19/day)	Heavy (20+/day)
	n=57	n=42	n=58	n=15	Linear Trend Statistic
Wave 1	1.520 (.024)	1.502 (.028)	1.485 (.024)	1.450 (.044)	t (1, 154)= −1.53, p <.128
Wave 3	3.250 (.038)	3.180 (.045)	3.176 (.038)	3.136 (.071)	t (1,165)= −1.69, p <.093
Wave 5	5.865 (.054)	5.695 (.063)	5.693 (.053)	5.529 (.099)	t (1,169)= −3.25, p <.001
V-I Latency	4.382 (.603)	4.192 (.361)	4.211 (.220)	4.076 (.220)	(t (1,154)= −2.76, p <.007

¹

Latency values for the waves represented means by group after adjusting for the child’s age in days at the time of the assessment and are in msec.