Table 4.

Among adults with past year prescription stimulant misuse in the U.S., main motivation for and source of prescription stimulants misused most recently by frequency of past month misuse and by past year prescription stimulant use disorders, weighted percentages

	Any past-year misusers N=3500a	The number of days of misuse in the past month				Misuse by past-year prescription stimulant use disorder (SUD)
		0 day n=2400a	1-2 days n=600a	3-6 days n=300a	7+ days n=200a	without SUD n=3200a	with SUD n=300a
Main motivation
Lose weight	4.07	4.22	3.20	4.71	3.85	3.75c	7.93
Help be alert/concentrate	56.34	54.42	57.09	60.28	69.52b	56.33	56.21
Help study	21.88	24.60	17.93b	15.86b	11.47b	23.07c	9.21
Get high/hooked/Adj. drug effects/experiment	15.53	14.91	18.80	14.84	14.78	14.76c	23.63
Other	2.17	1.85	2.97	4.31	*	2.09	3.02
Source
Free from friend/relative	56.87	58.77	56.76	50.94	44.90b	59.23c	30.87
Bought/stole from friend/relative	21.77	20.92	26.39b	24.39	15.06	22.28	16.12
One or more doctor	11.09	10.09	6.50	17.18b	25.23b	8.55c	37.70
Drug dealer/stranger	4.33	4.00	3.97	4.13	9.17b	3.90c	8.73
Other	5.94	6.21	6.38	3.35	5.64	6.04	6.58

N=overall unweighted sample size. n=unweighted sample size for each column.

^aSAMHSA requires that any description of overall sample sizes based on the restricted use data files be rounded to the nearest 100 to minimize potential disclosure risk.

^bEstimate is statistically significantly different from that for lowest frequency misusers (0 day in the past month) (p < .05).

^cEstimate is statistically significantly different from that for misusers with prescription stimulant use disorders (p < .05).

^*Estimate suppressed due to low statistical precision.