Description

Methods (English)

Consent

Written consent was obtained from the children's parents before the start of the study. The project was first authorized by the Vice-Rectorate and then presented to the school directors. The targeted schools were contacted, and the project was then proposed to the teaching teams for their acceptance.

Data collection

Data were collected between July 2018 and April 2019, from 1060 school-going adolescents (10–16 years old) during class time. In each school, two classes per level (6th, 5th, 4th, 3rd) were chosen to respond to the anonymous questionnaire, which consisted of two parts lasting 30 minutes each and was carried out in two stages.

About 30 participants (according to the number of devices available) per school were randomly selected to wear a GENEActiv accelerometer device for 5 to 7 consecutive days, or more. Consenting participants wore the device for 7 days. When a participant refused to wear the device, another random draw was made. A total of 211 adolescents accepted to wear an accelerometer device.

Data readability, validity and conversion

We were not able to get data from 5 adolescent devices because of device or record failure. In this dataset containing 231 files, 206 files are from adolescents and 25 are from adults (volunteer parents).

Raw data files are readable with common software libraries, like the R package GENEAread as well as with the GENEActiv software.

The current .csv data files were obtained thanks to the following steps:

1. Data collection with GENEActiv accelerometer device: data is stored in devices
2. Data extraction with the GENEActiv software: data is stored in .bin files
3. Data conversion with the R package GENEAread: consider the code in the read_a_binFile_share.R in the current dataset [reading the file, computing support vector magnitude (SVMg) from x, y and z acceleration, grouping data in 1 second blocs (timestamp: min grouping; x, y and z axes: mean and standard deviation grouping; light and temperature: mean grouping; SVMg: sum grouping)]
4. Saving the file in .csv format

Table of contents (English)

Description of the files

Accelerometer .csv files

Accelerometer .csv files are conversions from .bin files collected with GENEActiv accelerometer device and extracted with the GENEActiv software. They are 1 second epoch files. Each accelerometer .csv file contains the following columns:

timestamp: start time of the 1 second epoch
xm: 1 second epoch average of the x acceleration
ym: 1 second epoch average of the y acceleration
zm: 1 second epoch average of the z acceleration
lightm: 1 second epoch average of the light
tempm: 1 second epoch average of the temperature
svmgsum: 1 second epoch sum of the SVMg
sdx: 1 second epoch standard deviation of the x acceleration
sdy: 1 second epoch standard deviationof the y acceleration
sdz: 1 second epoch standard deviationof the z acceleration
id: name of the original .bin file

Code for extraction and conversion

The read_a_binFile_share.R is an example of R code that uses the GENEAread library to extract information from a .bin GENEActiv file, compute the support vector magnitude (SVMg) from x, y and z accelerations, group the information in a 1 second epoch record and save the result in a .csv file.

Participant characteristics

participantCharacteristics.csv file describes the participants with de-identified information. Here are the meaning of the columns:

Participant ID: Participant ID for this study
Participant status: Participant status in the study ("Adolescent" or "Adult")
Age range: Age range of the adolescent participant ("Less than or equal to 12", "Between 13 and 14 inclusive" or "Greater than or equal to 15"); unknown for adults
Sex: Sex of the participant ("Female" or "Male")
GeneActiv file: GENEActiv file (with no extension) associated with the participant
Starting Day: Starting day of data collection, i.e. first day the device is worn
Day of removal: Day of device removal, i.e. last day the device is worn
DOI of the non-anonymized repository: DOI of the repository where is stored the .bin file
DOI of the anonymized repository: DOI of the repository where is stored the accelerometer .csv file