affecting one in four female teenagers and one in five women aged 18 to 45, respectively.(Para. 4) affecting one out of four female teenagers and (also affecting) one out of five women who are aged from 18 to 45 Please note that“ respectively” modifies 4one in four female teenagers and one in five women aged 18 to 45• …affecting one in four female teenagers and one in five women aged 18 to 45, respectively. (Para. 4) …affecting one out of four female teenagers and (also affecting) one out of five women who are aged from 18 to 45. Please note that “respectively” modifies “one in four female teenagers and one in five women aged 18 to 45”.