Table 2.

Age (years) volunteers began consuming caffeinated beverages. Also, times of day they begin/end consuming

	Consume irregularly (<100 mg per week)		Consume regularly (>100 mg per week)
n	10		15
Mean	12±2 years		12±1 years
Range	5-17 years		4-16 years
Time of day	7:30 a.m.	8:00 p.m.	7:00 a.m.	11:00 p.m.
	Begin	End	Begin	End

n, sample size; mg, estimated milligrams of caffeine consumed per day/week.