Table 1 Study characteristics extracted for each observational study wave

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