The study, carried out by researchers at the University of Florida, was conducted on a large scale, with 12,686 men and women interviewed in 1979, when they were aged between 14 and 22, and three times in the following two decades, the last time in 2005.
The researchers asked them whether they believed a woman's place was in the home, or whether the employment of women was likely to lead to higher rates of juvenile delinquency.
Predictably, more men tended to hold these views than women, although the gap has narrowed significantly over time.
However, when the men were asked about their salaries, another gap emerged, with those holding "traditional" views earning significantly more.
Conversely, women who held the opposite view did earn slightly more, on average $1,500 (£833) more than women with "traditional" views.
All sorts of theories abound about why this might be; men who wield power in their relationships also do so in their jobs and thus end up more highly paid; women in the workplace, and men who take on non-traditional roles, are subtly discriminated against; work that has historically been done primarily by women is significantly undervalued whether it is paid or unpaid; men who are the only source of income for their family are more likely to get promoted because their employer recognises they need the money (I find that one a bit bizarre).
For my family this potential pay gap is about to become highly relevant. After nine months off from my paid job, while my partner worked full time in the job he's had a while, we are about to swap places; swivelly chairs for high chairs, pant suits for sleepy suits, that kind of thing.
I don't have any particular worries about my workplace, or my employer's attitude to mothers. They've certainly been great so far, and made it clear they are looking forward to having me back on Monday.
But I am starting to get the impression I'm lucky. I have observed other employers treating mothers who work less kindly than fathers who do so, particularly when mum first comes back from maternity leave. Anyone who has read I Don't Know How She Does It cannot escape the observation Reddy makes, that men who leave early to attend a child's sports event are Fathers of the Year, while women who are a little bit late because their offspring vomited all night are letting their home life get in the way of their work.
I'm sure this attitude is changing, for the better, and many women, in New Zealand anyway, don't face frequent and open disapproval for not staying home full time until their child is at school. But it's the subtle stuff that dismays me still. In my office there are a number of fathers of young children, and in some ways they have blazed a trail for me. One has an arrangement that he comes into work a bit later so he can take his kids to school; another takes off a week in each school holidays to look after his three children; a third took a month off at the birth of his daughter and negotiated a day a week working from home. My hope is that as more men ask, and are granted, arrangements like this it becomes easier for mothers too.
I guess I'll be finding out in the coming months...