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The phrase "advantage at the upper" is not correct and does not convey a clear meaning in written English.
It may be intended to describe a favorable position or benefit at a higher level, but the phrasing is awkward and unclear.
Example: "The team had an advantage at the upper levels of the competition, allowing them to secure a win."
Alternatives: "upper hand" or "advantage at the top".
Exact(1)
At the secondary level, the gender difference in favour of males observed up to TIMSS 1999, at the lower and at upper tail of the distribution, has changed since the year 2000 in both the IEA and PISA surveys: at the lower tail, girls tend to perform somewhat better than males, and the male advantage at the upper tail tends to fade away across time.
Similar(59)
For instance, Halpern and colleagues (2007, p. 40) conclude their review on sex differences in science and mathematics by arguing that "substantial evidence suggests that the male advantage in mathematics is largest at the upper end of the ability distribution".
Findings on the fifth-graders confirm that the male advantage in mathematics is more substantial at the upper tail of the ability distribution (e.g. Halpern et al. 2007; Baye and Monseur 2016) whereas the bottom of the reading achievement distribution is the part with the largest female advantage (Giambona and Porcu 2015; Baye and Monseur 2016).
Brooks and Hoeven's near-effortless campaigns affirmed the incumbent advantage in both the upper and lower chambers of Congress.
In this manner, Radiesse® may offer advantages for the upper arm area, over hyaluronic-acid treatments, 13 which while effective at providing initial improvement in arm contours, do not have the collagen-stimulating effect of Radiesse® for long-term results.
As in mathematics, male advantage in science is about twice as high at the upper end of the distribution than on the mean.
But among those who are deemed eligible there will still be a range of abilities, and those at the upper end of the scale will have an advantage.
At the upper echelon, the wealthy are hoping for green cards, joining with developers to take advantage of a federal program that fast-tracks them for residency.
At the upper level?
There is more at the upper end.
P.S.A. at the upper limit of normal?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com