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The phrase "at a mean" is correct and usable in written English.
It is typically used in statistical contexts to refer to the average value of a set of data points.
Example: "The results of the experiment showed that the participants scored at a mean of 75 points."
Alternatives: "at an average" or "at a median".
Exact(60)
OTUs plotted were present at a mean abundance of ≥0.1%.
Propranolol was initiated at a mean age of 6.6 months at a mean dose of 2.1 mg/kg/day and for a mean treatment duration of 6.4 months.
Prestage II cardiac catheterization was performed at a mean age of 126 days.
Seventeen subjects who had MDO at a mean age of 87±9696 days were included.
Average Knee Society Score was 87.1 at a mean follow-up of 5.2 years.
The soils showed a significant contamination with Tl at a mean concentration of 1.34 mg/kg.
The patients were evaluated at a mean of 2.2 years after pancreaticoduodenectomy.
Results: Twelve (9.5%) babies had a pulmonary hemorrhage at a mean age of 38 hours.
They never required treatment, and menarche occurred at a mean chronologic age of 11.9 ± 0.6 years.
Intact atrophied synthetic mandibles broke at a mean (SD) load of 729.48 (59.94) N (control group).
Radiographic evaluation was performed at a mean of 4.8 years' postarthroplasty (range, 2 8.6 years).
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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