The phrase 'should be controlled for' is a correct, usable phrase in written English.
You can use it when discussing an important factor that should be considered when conducting a study or experiment. For example, "In this experiment, environmental variables should be controlled for in order to ensure reliable results."
It can and should be controlled for the benefit of its residents, not for others.
It shows that several grout parameters should be controlled for a successful injection.
Tritium in the TBMs and the ancillary systems should be controlled for the sake of radiological safety.
In the commentary by Bianchi and Laurent (2015), the authors suggest that depressive symptoms should be controlled for when examining the neurobiology associated with trait neuroticism.
In terms of implications for future research, the current study suggests that the gender orientation of tasks can vary considerably and should be controlled for or taken into account when interpreting design performance results.
Regardless of the assumed tissue yield properties, the amount and type of damage that occurs in trabecular bone depends on the relative orientations of the applied apparent loads to the trabecular architecture, and this parameter should be controlled for both experimental and computational damage studies.
Consequently, these brands should be controlled and advised for their usage.
There should be controls for having the same number of input neurons to any pattern.
Therefore, concentration of citrate in samples should be controlled to be constant for background subtraction.
Meanwhile, the cooling water pressure should be controlled during the drilling process for better cooling efficiency.
Biases in subject selection and exposure assessment should be minimized, and confounding bias should also be controlled for in stratified or multiple regression analysis.
