Accelerometry-based physical activity summary estimates (median, IQR).

<p>^a Test of significance of difference between self- and interviewer-administered groups.</p><p>^b Valid wear time during waking hours.</p><p>Accelerometry-based physical activity summary estimates (median, IQR).</p

Bland-Altman plots for the agreement of physical activity measurement (min/day) between the GPAQ and accelerometer.

<p>Comparisons of total-minute of activity versus a 10-minute bout definition at each of three intensities: MVPA, vigorous-, and moderate- intensity activities for the total sample (n = 108).</p

Proportion of participants according to the GPAQ classification of meeting recommended physical activity levels (low, moderate, high) by self- and interviewer-administered groups (n = 110).

<p>^a Classification according to the GPAQ guidelines.</p><p>Proportion of participants according to the GPAQ classification of meeting recommended physical activity levels (low, moderate, high) by self- and interviewer-administered groups (n = 110).</p

Spearman correlation between the GPAQ and accelerometry-based summary estimates of physical activity level (min/day), according to self- and interviewer-administered groups.

<p>Spearman correlation between the GPAQ and accelerometry-based summary estimates of physical activity level (min/day), according to self- and interviewer-administered groups.</p

Test-retest reliability of physical activity domains (min/day) by self- and interviewer-administered groups (n = 110).

<p>Median (IQR) of physical activity on average per day.</p><p>^a Significantly different <i>r</i>_<i>s</i> between self- and interviewer-administered groups.</p><p>^b Significantly different ICC between self- and interviewer-administered groups.</p><p>^c Not estimable due to lack of readings for vigorous activity.</p><p>Test-retest reliability of physical activity domains (min/day) by self- and interviewer-administered groups (n = 110).</p

Flowchart of participants’ recruitment.

<p>Flowchart of participants’ recruitment.</p

Agreement between ActiGraph and Fitbit Flex for categorizing step-defined daily physical activity.

<p>Agreement between ActiGraph and Fitbit Flex for categorizing step-defined daily physical activity.</p

Comparison, relative agreement and median of absolute error in step counts between ActiGraph and Fitbit Flex: all participants, by gender and category of step-defined daily physical activity.

<p>Comparison, relative agreement and median of absolute error in step counts between ActiGraph and Fitbit Flex: all participants, by gender and category of step-defined daily physical activity.</p

Comparison of wrist-worn Fitbit Flex and waist-worn ActiGraph for measuring steps in free-living adults - Fig 3

<p><b>Bland-Altman plots of differences between waist-worn ActiGraph and wrist-worn Fitbit Flex against the mean according to: (A) Males, (B) Females, (C) Inactive days, and (D) Active days.</b> The solid lines represent median of the differences between devices, dotted lines are 10^th and 90^th percentiles of the differences.</p

Bland-Altman plot of differences between waist-worn ActiGraph and wrist-worn Fitbit Flex against the mean according to all participants.

<p>The solid line represents median of the differences between devices, dotted lines are 10^th and 90^th percentiles of the differences.</p