Table 3.

Exploratory analysis on associations between perceived helpfulness, patient factors and usage

	Helpful (n=23)	Not helpful (n=13)	p Value
Mean Beck’s Depression Inventory (BDI) score*	35 (SD 12.81)	38.15 (SD 9.09)	0.44
Mean per cent change in BDI score†	−21.51% (SD 33.91)	−34.75% (SD 28.79)	0.283
Mean age in years‡	52.57 (SD 13.90)	54.17 (SD 9.13)	0.72
Pretherapy physical activity goals	13	6	0.549
Prior smartphone use	15	8	0.825
Mean weeks used§	18.57 (SD 1.21)	12.27 (SD 5.76)	<0.001

*BDI scores may range from 0 to 63, where higher scores indicate higher severity of depression.

†Five participants were excluded due to lack of data; three had found the Fitbit helpful.

‡One participant who found the Fitbit not helpful was excluded due to lack of age data.

§Four participants were excluded due to lack of data; two had found the Fitbit helpful.