Table 2.

Within-group differences in device use in daily activities.

Daily activities	Two weeks, mean (SD)	Two months, mean (SD)	P value
Ambulating	4.31 (0.92)	4.15 (1.12)	.47
Driving (or being driven)	4.04 (0.77)	4.12 (0.76)	.16
Grocery shopping or shopping	3.69 (1.28)	3.58 (1.23)	.54
Relaxing (TV)	4.00 (1.06)	3.31(1.10)	.20
Housekeeping	3.35 (1.09)	3.27 (1.00)	.67
Preparing meals	2.77 (0.99)	2.50 (1.06)	.07
Personal hygiene	2.42 (0.94)	2.27 (0.96)	.49