The phrase "were affected more" is grammatically correct and can be used in written English.
It is usually used to describe a situation where one group or individual experiences more impact or consequences than others. Example: During the economic recession, low-income families were affected more than wealthy families.
In one large study, men and women were equally affected (Shiri et al. 2006) while females were affected more than males in another study (Buchbinder et al. 2008).
Compared with affected infants in the Northern Hemisphere, infants in New South Wales were slightly older, both sexes were affected more equally, and rash occurred with considerably higher frequency.
Women were affected more than men.
Girls were affected more than boys.
And lower elevations were affected more than upper ones, which tend to be cooler and wetter.
But analysts said the bond markets were affected more by evidence of rising employment and faster inflation than by the Fed's hints.
Across the state nearly two million livestock and working animals including pigs, goats, sheep, horses and cows were affected, more than 10% of the state's total livestock population.
Bevan defended levels of spending on flood defences and said existing defences had prevented thousands of homes being inundated and given those who were affected more time to prepare.
Nearly 2 million people were affected, more than 100,000 of them displaced from their homes after the storm dumped 16.7 inches of rain in just 12 hours on Saturday.
According to modern-day legend, not only did the presence of these apex predators change the behaviours of the ungulates in the area, but after wolves were re-introduced, the overall variety of native plants and animals increased – and even the course of the rivers flowing through Yellowstone were affected (more here).
In general, ecosystem characteristics were affected more by temporal variation between years than by construction method.
