. 2019 Feb 14;7(2):e10988. doi: 10.2196/10988

Table 5.

The correlation matrix showing relationships among habits associated with wear and use of Fitbits, objectively measured Fitbit wear and steps during the intervention (data collected from Fitbits via Fitabase), and primary outcomes for active and sedentary behaviors (data collected via ActiGraph and activPAL monitors).

Habit and Outcome Variables	Habits				Fitbit (1-12 weeks), mean		MVPA^b		Steps	Sedentary
	Wearing FB^a	Checking data on FB	Checking data on app	Total	Days of wear	Steps	Total	In bouts	Steps	Total	In bouts
Habits for wearing FB	1	N/A^c	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Habits for checking data on FB	.51^d	1	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Habits for checking data on app	.41^d	.62^d	1	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Habit total	.74^d	.88^d	.84^d	1	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Days of FB wear (1-12 weeks), mean	.48^d	.22^e	.38^d	.43^d	1	N/A	N/A	N/A	N/A	N/A	N/A
FB steps (1-12 weeks), mean	.10	.27^e	.35^d	.30^d	.21^e	1	N/A	N/A	N/A	N/A	N/A
MVPA total	.02	.23^e	.19	.18	.06	.78^d	1	N/A	N/A	N/A	N/A
MVPA in bouts	.10	.21	.27^e	.24^e	.15	.67^d	.86^d	1	N/A	N/A	N/A
Steps	.02	.25^b	.27^c	.23^e	.04	.69^d	.85^d	.71^e	1	N/A	N/A
Sedentary total	.25^a	−.06	−.11	.01	.10	−.40^d	−.38^d	−.24^e	−.38^d	1	N/A
Sedentary bouts	.11	−.18	−.17	−.12	.12	−.43^d	−.47^d	−.27^d	−.47^d	.83^d	1

^aFB: Fitbit.

^bMVPA: moderate-to-vigorous intensity physical activity.

^cN/A: not applicable.

^dSignificant at P<.01.

^eSignificant at P<.05.