The phrase "affect the extent" is correct and usable in written English.
You can use it when discussing how one factor influences the degree or range of another factor.
Example: "The new policy changes will significantly affect the extent of employee benefits offered by the company."
Alternatives: "influence the degree" or "impact the range".
Educational differences between speakers strongly affect the extent of their vocabulary.
Both concentration and the molecular structure of the additives affect the extent of these alterations.
Processing conditions, specifically the solvent concentration, strongly affect the extent of primary cyclization.
These differences are likely to affect the extent to which the practice is abandoned when women migrate and underline the need to avoid stereotyping individuals.
However, several factors can affect the extent to which relevant articles are retrieved, influencing future research and conclusions drawn.
Neither temporary shortage of capacity nor geographical dispersion of activities seem to affect the extent of subcontracting.
Both the activator UBX and the repressor EVE affect the extent but not the rate constant of preinitiation complex (preIC) formation.
Care was exercised to achieve precision in strain-rate control in these tests since strain-rate and temperature history do affect the extent of cavitation.
As an uninhabitable rock, it does not affect the extent of UK's territorial waters (which extends 200 nautical miles from St Kilda and so embraces Rockall) or its continental shelf.
The state of mixing in a continuous flow vessel is shown to affect the extent of aggregation and the extent of aggregation at which mathematical gelation occurs.
Residual stress in ductile thin films is shown to significantly affect the extent of film plasticity and interfacial fracture energy during debonding in thin-film structures.
