Table 1.

Study characteristics extracted for each observational study wave

Study variable	Description
Descriptive information
Study name	The given name of the cohort study and study acronym
Year of measurement	The year in which the accelerometer measurement began
Methods employed for collection of data on physical behaviours
Accelerometer used	The accelerometer device chosen for data collection (manufacturer make and model)
Accelerometer wear location	The body location at which the accelerometer was worn
Accelerometer distribution method	The method by which participants received an accelerometer
Accelerometer return method	The method by which accelerometers were returned to investigators following measurement
Accelerometer wear instructions	The time period over which participants were requested to wear an accelerometer
Participant follow-up	Whether participants were contacted during the measurement period
Minimum valid wear criteria	The minimum amount of accelerometer wear required for a data file to be included in analyses
Outcomes from measurement of physical behaviours
N Invited	The number of participants invited to wear an accelerometer
N Consented	The number of participants invited to wear an accelerometer who consented
N Devices lost	The number of accelerometers lost during measurement
Average daily valid accelerometer wear	Average daily valid accelerometer wear reported in hours per day (or calculated from reported values if possible)
N adhered	The number of people who met the minimum wear criteria and were included in analyses
Response bias	Reported demographic differences between those meeting wear criteria and those invited or the original study sample
Adverse events	The number and description of any adverse events relating to accelerometer wear