Not the mentioned study, but still interesting.

https://journals.lww.com/acsm-msse/fulltext/2010/10000/pedometer_measured_physical_activity_and_health.4.aspx

Adults reported taking an average of 5117 steps per day. Male gender, younger age, higher education level, single marital status, and lower body mass index were all positively associated with steps per day. Steps per day were positively related to other self-reported measures of physical activity and negatively related to self-reported measures on physical inactivity. Living environment (urban, suburban, or rural) and eating habits were not associated with steps per day.

Important to note that study participants may not be reflective of the average American.

Edit: 1 miles is apparently near 2,000 steps. (From another article which credited “researchers”.)