Table 1.

Demographic characteristics of subjects.

	Abstinent MADs (n = 70)	Healthy controls (n = 84)	p
Age (years)*	27 (25,33.00)	29 (26,45)	0.089
Gender (male/female)	59/11	66/18	0.486
Education (years)*	12 (9,14)	12 (9,18)	0.160
BMI*	24.22 (21.73,25.92)	22.41 (20.03,24.64)	0.007
CPD*	20 (10,20)	0 (0,15)	< 0.001
Head motion (mm)#	0.112 ± 0.092	0.092 ± 0.049	0.097
Age started using MA (years old)#	23.51 ± 5.58	N/A	N/A
Duration of MA use (months)*	60.0 (36.5,76.50)	N/A	N/A
Abstinence from using MA (days)*	38.5 (26.0,47.0)	N/A	N/A

*Median (interquartile range) and Mann–Whitney test are presented.

^#Mean (standard deviation) and two sample t-test are presented.