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

Published in final edited form as: Neurotoxicol Teratol. 2010 Jul 6;33(1):166–175. doi: 10.1016/j.ntt.2010.06.009

Table 4.

Frequency of self-reported methamphetamine use in US and NZ

MA use	US (N=175)			NZ (N=83)

	Trimester
	First	Second	Third	First	Second	Third

	N (%)	N (%)	N (%)	N (%)	N (%)	N (%)
Daily	31 (18%)	17 (10%)	6 (3%)	12 (15%)	4 (5%)	1 (1%)
3–6 days/wk.	50 (29%)	23 (13%)	14 (8%)	19 (23%)	7 (8%)	4 (5%)
1–2 days/wk.	25 (14%)	17 (10%)	10 (6%)	18 (22%)	11 (13%)	7 (9%)
1–3 days/mo.	15 (8%)	18 (10%)	12 (7%)	12 (14%)	11 (13%)	8 (10%)
1–2 days/3 mos.	29 (17%)	20 (11%)	26 (15%)	17 (20%)	8 (10%)	13 (15%)
Not at all	25 (14%)	80 (46%)	107 (61%)	5 (6%)	42 (51%)	50 (60%)

Days/week (mean, SD)	2.64 (2.59)	1.39 (2.26)	0.69 (0.17)	2.37 (2.47)	0.99 (1.88)	0.45 (1.19)
Heavy use (≥3 day/wk)		35 (20%) ^*			8 (10%)

^*

P=0.037