It was self-reported by 1,200 US staff – 2 per cent of the global workforce – meaning it is not a comprehensive analysis.
But the disparities are startling and at five of the six job levels women are paid less than men.
At level one, the lowest, women earned $40,300 (£30,500) compared to $55,900 (£42,300) for men, a difference of $15,600 (£11,800), the biggest out of all employees.
At level two women earned more than men, $76,600 (£58,000) compared to $71,200 (£53,900) for men.
At level three, the entry level for technical positions, women earned $106,700 (£80,800) compared to $112,400 (£85,100) for men.
At level four women earned $125,000 (£94,600) versus $136,600 (£103,400) and at level five the numbers were $153,500 (£116,200) for women compared to $162,200 (£122,800) for men.
At level six, executive level, women were paid $193,200 (£146,300) versus $197,600 (£149,600) for their male counterparts.
For bonuses women were awarded less than men at three of the six levels.
The biggest disparity was at level six where women earned $40,700 (£30,800) in bonuses compared to $47,800 (£36,200) for men, a difference of $7,100 (£5,400).
Note my emphasis on “significant“.