The figure of 2,100 calories is generally recommended to sustain an average adult.

But, he said, from 1965 to 1975 there was a gain of five hours a week in the average adult's leisure time.

"They hear it much more easily than the average adult."

One ate a diet similar to what the average American adult now eats.

The average adult's attention span can vary depending on the individual.

This number can vary as smaller people and children have faster heart rates than average adults.

Eight hours of sleep is recommended per night for the average adult.

That's about 30 times that of the average British adult.

Around 10 platelets are produced each day by an average healthy adult.

The boys were 14 to 16 years old, making them more compliant than the average adult.