"fall twofold" is correct and can be used in written English
It means to decline or decrease by two times or in two aspects. Example: The company's profits fell twofold last year due to poor sales and increased expenses.
Hence, the uncertainty in PD was set to let 95% of the samples fall within twofold of the point estimate.
In acknowledgment of this, a common practice is to empirically denote models exhibiting mean estimates falling within twofold error from observed PK data as acceptable.
The in vitro assay potency results fell within twofold of the potency seen ex vivo in human whole blood, for two reference compounds with reported clinical data, targeting the same pathway.
2 4 6 In terms of medications, polypharmacy usually increased the risk of falls higher than twofold, 2 4 and the main group of drugs are benzodiazepines, antidepressants, antipsychotics and antiepileptics.
The reasons for premature stop of growth are twofold: shear stress falls not only because the vessel radius increases, as discussed but also because metabolic autoregulation limits blood flow to the actual need of the tissue.
Once someone was frail, he had a twofold to fourfold increased risk of falling, becoming disabled or dying in the next three years.
So, my twofold hope after this tiny-scale rise and fall?
My over-riding goal is twofold: number one, I want the readers to fall in love with their Earth Mother all over again - to rediscover the beauty and the mystery and the joy in our natural environment.
Fall-related fracture rates increased gradually with age and were on average twofold higher among women.
The incidence of fall-related fracture rates increased with advancing age and were on average twofold higher among women (figure 1).
