Table 2.

Sample device use.

Variable		PFa, n	IFb, n	χ2	Total, N=49	dfc	P
Use computer daily				0.2	49	1	.626
	Yes	24	22
	No	2	1
Use mobile device daily				3.5	49	1	.062
	Yes	10	15
	No	16	8
Use smartphone				0.3	49	1	.560
	Yes	6	7
	No	20	16
Use tablet or e-reader				0.8	49	1	.357
	Yes	8	10
	No	18	13

^aPF=Paper-first group

^bIF=iPad-first group

^cdf=degrees of freedom