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

Published in final edited form as: Neurotoxicol Teratol. 2010 Jun 30;33(1):69–77. doi: 10.1016/j.ntt.2010.06.003

Table 2.

Prevalence of Cocaine Use (%)

	Level of Use
Time Period	None	Occasional^a	Frequent^b
Year prior to pregnancy (N = 241)	55.2	23.2	21.6
First trimester (N = 243)	57.2	23.0	19.8
Second trimester (N = 218)	91.7	3.2	5.0
Third trimester (N = 240)	88.7	4.6	6.7
One-year follow-up (N = 231)	84.4	7.8	7.8
Three-year follow-up (N = 234)	87.2	6.4	6.4
Seven-year follow-up (N = 243)	91.4	5.8	2.9

^a

Occasional: > 0 and < 1 line/day of cocaine or gram equivalent of crack

^b

Frequent: ≥ 1 line/day of cocaine or gram equivalent of crack