Additional file 1: of Development and application of an automated algorithm to identify a window of consecutive days of accelerometer wear for large-scale studies

OPACH daily sleep log

Additional file 2: of Development and application of an automated algorithm to identify a window of consecutive days of accelerometer wear for large-scale studies

R code for execution of OPACH algorithm

An Activity Index for Raw Accelerometry Data and Its Comparison with Other Activity Metrics - Fig 6

<p>The “receiver operating characteristic” (ROC) curves of Activity Index (AI), activity count (AC), AC with Low Frequency Extension (LFE) and Euclidean Norm Minus One (ENMO) to predict whether metabolic equivalents (MET) is smaller or greater than 3 (A) and 1.5 (B), and whether MET is bigger than 1.5 but smaller than 3 (C). The ROC curves for AI, AC and ENMO are solid, dashed and dotted, respectively, while AC with and without LFE are rendered in purple and orange. The corresponding area under the curve (AUC) of each ROC curve is given in the legend section.</p

The “receiver operating characteristic” (ROC) curves for distinguishing four pairs of activity types, using Activity Index (AI, solid curves) or activity count (AC, dashed curves in different color for AC with and without Low Frequency Extension (LFE)) or Euclidean Norm Minus One (ENMO, dotted curves), respectively.

<p>The corresponding area under the curve (AUC) of each ROC curve is given in the legend section.</p

A general framework for accelerometer-related studies.

<p>The left panel illustrates two general data types: raw data and summary measures. The right panel shows 4 common research interests. The mid panel contains 6 common analysis pathways between the data and the research interests.</p

An Activity Index for Raw Accelerometry Data and Its Comparison with Other Activity Metrics - Fig 5

<p>Scatterplots of metabolic equivalents (METs) versus Activity Index (AI) (A), activity count (AC) (B), AC with Low Frequency Extension (LFE) (C) and Euclidean Norm Minus One (ENMO) (D). MET is on <i>x</i>-axis for all four plots, while AI, AC, AC (LFE) and ENMO are on the <i>y</i>-axis in (A), (B), (C) and (D), respectively. Each point in the figure represents a participant's median METs during a certain activity (rendered in different colors) versus the median AI, AC or ENMO while he/she was performing the same activity.</p

Comparison of the boxplots of Activity Index (AI), activity count (AC), AC with Low Frequency Extention (LFE) and Euclidean Norm Minus One (ENMO) during different types of activities.

<p>Outliers outside of the upper and lower whiskers are omitted. Each type of summary metric from all the participants were pooled together and plotted according to the type of activity.</p

Summary Statistics of AI, AC, AC (LFE), and ENMO of each activity.

<p>Summary Statistics of AI, AC, AC (LFE), and ENMO of each activity.</p

Additional file 1: of The Objective Physical Activity and Cardiovascular Disease Health in Older Women (OPACH) Study

OPACH PA Questionnaire. (DOCX 351 kb