. Author manuscript; available in PMC: 2022 Jan 1.

Published in final edited form as: Addict Biol. 2020 Feb 4;26(1):e12876. doi: 10.1111/adb.12876

Table 2.

Drug characteristics and history for MA users (n = 11)

Characteristics		Mean ± SD (Range)
Age of onset (years)		28.9 ± 16.5 (17–68)
Duration of use (years)		11.1 ± 9.70 (2–34)
Frequency (days/week)		4.84 ± 2.08 (1–7)
Amount used/week (grams)		1.81 ± 1.83 (0.1–5.3)
Route of MA administration (smoked, IV, oral, nasal)^*		9, 1, 2, 2
MA Severity of Dependence Scale		7.27 ± 2.34
Polysubstance (hair)		All MA/AM; 8 cocaine; 5 THC-COOH; 2 opiates; 1 MDMA
# Marijuana users (hair)		5
MA abstinence before PET scan (hours)		39.2 ± 28.8 (14.3–110)
Blood levels of MA/AM on PET day (nmol/ml)		2.00 ± 2.56 (0–5.57)
MA withdrawal:	ASSA (n = 8)	55.8 ± 20.1
MA withdrawal:	AWQ (n = 8)	22.9 ± 8.00
DSQ	Total	117 ± 33.6
	Reinforcement	22.0 ± 8.78
	Strong desire	26.8 ± 12.4
	Mild desire	16.0 ± 8.07
	Control	7.38 ± 3.34

some MA users had mulitple routes of administration

MA = methamphetamine, PET = positron emission tomography, AM = amphetamine, ASSA = Amphetamine Selective Severity Assessment, AWQ = Amphetamine Withdrawal Questionnaire, DSQ = Desire for Speed Questionnaire, AM = amphetamine, THC-COOH = 11-Nor-9-carboxy-Δ⁹-tetrahydrocannabinol, MDMA = 3,4-Methylenedioxymethamphetamine