PRIME Minister Julia Gillard says reports of an increasing gender pay gap are concerning despite claims the statistics weren't portrayed accurately.

The Workplace Gender Equality Agency (WGEA) says the gender pay gap for young university graduates more than doubled last year, from $2000 to $5000 a year.

However, Graduate Careers Australia (GCA) on Friday told media the federal government agency had oversimplified the data, resulting in the misrepresentation of gender pay differences and that the gap remained at three per cent.

Ms Gillard on Saturday said she had seen the media reports that said the way in which those statistics were used weren't 100 per cent accurate.

"So I'm going to need to drill down to the very specific statistics here," she told ABC News 24.

"But any gender pay gap concerns me, whether it's for graduates or people who have been in the workforce for a long time."

Ms Gillard said her government had already acted to make a difference to gender pay inequality.

"The industrial relations system we have now has a principle at its centre, which is that women and what is viewed as women's work traditionally should not be the subject of lower pay rates," she said.

"We haven't just enacted a bill about it. We've actually put our money where it should be with around a $2 billion investment to deal with the long-term disadvantage that social and community services workers are faced (with), basically, because they tend to be women."

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Originally published as PM 'concerned' by gender pay gap reports