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The phrase "efficacy is" is grammatically correct and can be used in written English
It can be used to introduce a statement or explanation about the effectiveness or ability of something. Example: The efficacy of this new medication is yet to be determined, but early clinical trials have shown promising results.
Exact(59)
But efficacy is not the issue here.
But evidence proving their efficacy is mixed.
"Proving safety and efficacy is needed," she says.
The difficulty of proving its efficacy is clearly one of the biggest stumbling blocks.
In fact, the technology has been around for years, and its efficacy is an established fact.
To be sure, efficacy is not always the issue for patients, even well-informed ones.
Establishing a drug's safety and efficacy is not a pretty business.
There is a Lyme vaccine, but its efficacy is uncertain.
In addition, electronic cigarettes are currently very lightly regulated so their safety and efficacy is not guaranteed.
But the convention's efficacy is only guaranteed once member states ratify it – none has yet done so.
Similar(1)
The most direct and effective way to enhance self-efficacy is through performance mastery experiences.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com