The phrase "was approximately doubled" is grammatically correct and can be used in written English.
Example: The company's profits were approximately doubled after they introduced a new marketing strategy.
It is interesting to note that the number of DBGA and I-DBGA targets at 24 hour was approximately doubled compared to 4 hour, while an approximate 5-fold increase in the number of NGA targets was observed at 24 hours.
The number was approximately doubled in the next seven years.
The leakage current measured during the potentiostatic period as well as the amplitude of self-discharge increased with Ui; the cell potential drop was approximately doubled by 10 °C increase of temperature.
RESULTS The prevalence of lifetime disorder to age 32 was approximately doubled in prospective as compared to retrospective data for all four disorder types.
On the other hand, the percentage increase in load carrying capacity was approximately doubled in specimen CF1, as compared to the control specimen.
In contrast, release of dopamine in response to electrical stimulation was approximately doubled in striatum of TKO mice, both in vivo and in striatal slices, in comparison to wild-type controls.
In particular, the resolving power can be approximately doubled compared to "typical" conditions.
Compared to the standard single-pulse mixing sequences, the sensitivity is approximately doubled in the present experiments.
Veterinary costs were approximately doubled for heifers fed 2 L of colostrum compared with heifers fed 4 L of colostrum.
If all the sodium chloride in evaporites were added to the oceans today, the salinity would be approximately doubled.
From the result of the experiment, the final drawing speed can be approximately doubled in relation to that of the current drawing process.
