A new study from the Pew Research Center shows that more dads than ever are staying home full-time with their children. In families consisting of married couples with children where one spouse worked at least 35 hours per week, roughly 3.5% of those households include a stay-at-home dad.

This study, led by University of Illinois sociologist Karen Z. Kramer, attaches solid data to perceived changes in family gender roles over the past few decades. Today, roughly one-third of families consist of a stay-at-home mother, down from one-half during the 1970s, and families where both mom and dad work at least 35 hours a week has increased from 46.1% to 63.2% during that time.

This study provides many openings for further research, such as changes (or lack thereof) in gender equity in the workplace and the home. For example, families with stay-at-home dads earned about $11,000 less than those with stay-at-home moms. How much of this difference is attributable to the gender pay gap? Or do breadwinning mothers differ from breadwinning fathers in areas such as educational attainment and job prestige?

With this study as a point of departure, social scientists interested in such areas as gender, the family, and the life course, as well as many others, will have plenty of material to work with.