"extra factors" is correct and can be used in written English.
It is usually used to refer to additional elements or components that have an impact on a situation. For example: "The committee had to take into account extra factors, such as the cost of materials, when setting the budget for the project."
What are the extra factors which tip them into extreme violence?
It is important to stress that my work requires admin, organisation and most importantly practice and each performance (with these extra factors included) is often paid well under the national minimum wage.
This is a genuinely interesting piece of music for its own sake, without referring to any extra factors (lyrics or a suggestive title to tell us what it is about), nor merely flexing the band's musical muscle.
With cave diving, there are extra factors beyond human control that you can only best prepare for, particularly in exploring new territory.
"I think what we're dealing with – another paradox – is that the classical parts offer a certain very exciting and demanding discipline, between technique and passion and style and command of the stage and sense of period, and all those extra factors that are a good challenge for an actor.
He said that criticism was "not accurate if you look at the history of the cases we've done," citing as examples cases in which the office had charged people in Mann Act cases, and in which extra factors weighed in favor of that, as with juvenile prostitutes.
But the extra factor of Wright's family link to Baker tipped the balance.
Correcting for an extra factor is best understood by doing something called "stratification".
Strictly It Takes Two Extra Factor Thronecast Talking Dead Get Me Out Of Here Now.
That could be the extra factor that carries NCsoft's valuation to $3 billion from $1.3 billion, he said.
The extra factor needed to bring it about was a combination of personalities.
