Working moms spend more time multitasking than working dads – and the experience of keeping multiple balls in the air at once is more stressful for the moms than for their male counterparts.

At least those are the findings of a provocative new study of American families. It showed that working mothers spend almost 10 more hours a week multitasking than do working fathers – 48 hours a week for moms compared to 39 for dads.

“This suggests that working mothers are doing two activities at once more than two-fifths of the time they are awake, while working fathers are multitasking more than a third of their waking hours,” study author Dr. Barbara Schneider, a sociology professor at Michigan State University, said in a written statement.