Table 2. Means and standard deviations (in parentheses) for multi-tasking ability (OSPAN), perceived multi-tasking ability, impulsivity, and sensation seeking for participants in the upper and lower quartiles of multi-tasking activity (MMI).

Measure	Subcategory	Low MMI	High MMI	df	t-score	Cohen’s d
OSPAN		48.7 (16.0)	40.3 (16.3)	136	−3.04**	0.52
Perceived ability		59.2 (19.5)	69.1 (16.8)	136	3.21**	0.55
Impulsivity		1.96 (0.30)	2.11 (0.32)	135	2.79**	0.48
	Attentional	2.04 (0.41)	2.24 (0.46)	135	2.71**	0.46
	Motor	1.91 (0.32)	2.01 (0.35)	135	1.75	0.30
	Non planning	1.95 (0.39)	2.11 (0.41)	135	2.28*	0.40
Sensation seeking		1.43 (0.18)	1.51 (0.17)	135	2.51**	0.43
	Boredom	1.23 (0.20)	1.28 (0.16)	135	1.44	0.28
	Disinhibition	1.32 (0.26)	1.47 (0.30)	135	3.52**	0.53
	Thrill Seeking	1.67 (0.28)	1.71 (0.29)	135	0.67	0.14
	Experience	1.49 (0.24)	1.55 (0.22)	135	1.50	0.26

Also indicated are the degrees of freedom, t-test scores, and the effect size estimate, Cohen’s d.

^*Significant at .05 level.

^**Significant at .01 level.