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The phrase "were double that of" is grammatically correct and can be used in written English.
It is commonly used to compare two quantities, with one being twice the amount of the other. Here is an example: "The profits of the company in the first quarter were double that of the same period last year." This sentence is comparing the profits of the company in the first quarter to the profits in the same period last year, and stating that the profits this year were twice as much as last year. Another example: "The number of participants in the marathon were double that of last year's event." This sentence is comparing the number of participants in this year's marathon to the number in last year's marathon, and stating that there were twice as many participants this year.
Exact(14)
A spokesman for South American specialist Drago man said inquiries were double that of last year.
Averaged over multiple trials with similar ads, the study concluded that the click-through rate of the single-method ads were double that of those using multiple persuasion techniques.
US analysis of more than 500,000 births in North America and Europe found death rates for babies in planned home births were double that of those in planned hospital births.
In 19 states, the odds for African-Americans were double that of whites.
Table 5 and Table S2 (lower half) show the ICERs of each strategy versus the control (no antiviral medications for any patients) for scenarios in which influenza hospitalization risk and mortality were double that of seasonal influenza for older adults (65+ years old).
In contrast to the normal number of DN1 and DN2 cells, the absolute number of DN3 and DN4 cells in Egr-2 cTg mice were double that of wild type mice (Fig. 2 B and C) despite a similar level of Egr-2 transgene expression (Figure S1).
Similar(46)
The maternal mortality rate is double that of Latin America and four times that of East Asia.
The cost per cigarette is double that of tobacco roll-ups.
The number of antisemitic attacks in 2014 was double that of 2013.
The rate of unemployment in the trans community is double that of the population at large.
Killings by firearms in Germany are double that of the UK.
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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