"on average per day" is a correct and usable phrase in written English.
It can be used to express the average frequency or amount of something over a given period of time. For example: "Most adults sleep for 8 hours on average per day."
In case the women gave a positive answer on alcohol intake during pregnancy, they were asked "How much did you drink during the last month of the pregnancy?" For an answer, they were asked to specify the number of glasses drunk (on average) per day.
"The evidence-based assessment of the mortality rate of migrant workers in Qatar shows that at least one worker on average per day is dying.
High risk drinkers are those that drink on average per day more than one unit of alcohol if the subject is a female and more than two units of alcohol if the subject is a male.
Although one of the participants received and sent 150 200 SMS on average per day and another participant received and sent 350 400 SMS messages on average per day.
A key finding was that Infrequently Active children and youth – children and youth who accumulated 60 minutes of MVPA on average per day but who met this 60 minute target <5 days per week – were more insulin resistant than Frequently Active children and youth.
The sum total of calories: 356 calories on average per day.
Entertainment magnate David Geffen used 27,000 gallons on average per day between June and August.
More than 95m photos and videos are now shared on the platform on average per day, drawing 4.2bn likes.
After 12 months of rehabilitation, there was no significant difference regarding abstinence rate between 48 smoking alcoholics (who reported that they smoked 32 cigarettes on average per day) and 15 nonsmoking alcoholics (33% vs. 20%).
