The phrase "a proven factor" is correct and usable in written English.
It can be used when discussing something that has been demonstrated or established as a significant element in a particular context, such as research or analysis.
Example: "In the study of climate change, carbon emissions are identified as a proven factor contributing to global warming."
Alternatives: "a demonstrated element" or "an established factor".
"Experience is a proven factor when you appoint a captain.
And they have every incentive - a successful unfair dismissal claim brings maximum compensation of £63,000; but where discrimination is a proven factor, compensation is uncapped.
"I always ate tomatoes so so that wouldn't be a problem you know you don't have to eat supplements, if it's a proven factor then I would have to consider it" Mr J, aged 72.
Based on different prospective studies especially fibrinogen is considered as a proven hemostatic factor for an increased cardiovascular risk.
Incomplete removal of pathogens or their biofilms, in particular, is a proven risk factor for recurrence [ 31].
Radiation is a proven causing factor for PTC and a number of arguments support the view that H2O2-induced damage also contributes to initiate these tumours (see Introduction).
Positive assessment of Helicobacter pylori (HP) infection can help to identify high risk individuals since this is a proven risk factor for GC[ 3, 4].
In our study intravenous drug use (heroin or cocaine) was not a proven risk factor for previous or current syphilis infection, whereas it was observed in the study by Rolfs et al. [ 19].
In men, the postpubertal testosterone level is a proven dose-dependent factor when muscle strength and other physiological factors such as the blood haemoglobin level come into play.
Solid epidemiologic data indicate that prematurity is a consistently proven risk factor for severe LTRI induced by RSV [ 3, 21].
Tobacco use is a major proven risk factor and contributes substantially to the rising epidemic of non-communicable diseases.
