"risk increase" is correct and usable in written English.
You could use it in a sentence such as "The risk of infection increases with the number of people in the area."
"The risk increase is not insignificant".
If you are quoted a risk increase, check what the risk was before.
That is roughly the same risk increase experienced during sex or heavy exercise.
People who learn they carry a higher genetic risk of Type II diabetes, for instance, may see that risk increase if they start to gain weight.
For 17-year-old drivers, the risk increase was even larger; with three or more passengers it was triple the risk of driving alone.
The tipping point for a reduction in badger density at which a cattle risk reduction becomes a cattle risk increase is not known.
The analysis covered 17 types of cancer, but the relative risk increase was statistically significant for just 10 of them.
Get it wrong, and confusion and risk increase.
Patients with two copies have a 15-fold risk increase.
In the first category, the risk increase factors are low for all cases except for case C6 which has a medium risk increase factor.
The risk increase factor with respect to case C1 is between 1.1 and 12.5.
