Physical activity of Canadian adults: accelerometer results from the 2007 to 2009 Canadian Health Measures Survey.

By R. Colley, Didier Garriguet, Ian Janssen, C. Craig, Janine Clarke, Mark S. Tremblay. Health reports, 2011

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Daily Sitting Time and All-Cause Mortality: A Meta-Analysis (2013, background): “On average, adults in Western countries spend between 55% and 70% of their day sedentary, according to objective monitoring[4-6].”
Large Scale Population Assessment of Physical Activity Using Wrist Worn Accelerometers: The UK Biobank Study (2017, methodology): “Accelerometry is the most widely used method for objective assessment of physical activity in population studies [4,5], and large studies from the UK [6–8], US [9], and Canada [10] indicate age gradients and differences between men and women; time-of-day and day-of-week differences in physical activ”
Sedentary Time and Its Association With Risk for Disease Incidence, Mortality, and Hospitalization in Adults (2015, methodology): “Third, self-reported measures were predominantly used to assess physical activity exposure and were more vulnerable to biased estimates than those ascertained through more objective measurement techniques (such as accelerometry) (54, 55).”
Can the Affective Response to Exercise Predict Future Motives and Physical Activity Behavior? A Systematic Review of Published Evidence (2015, background): “For example, it is estimated that approximately 80 % of North Americans fall below this recommended value [6,7].”