I am not sure what FEV1's are, but I have visited my CF doctor 1nce a year for the past 10 years or so, and have gotten my yearly blood tests and done a breathing test where i have to blow out really hard for a long time and hold it, and I have ranked better then a normal person without CF. My CF dr has been more concerened with me gaining wieght then anything else. I stay active and play sports and ice hockey which my doctor said is good because if I can handle exercising in the cold air my lungs are in good shape. I also rarley get sick. I think I just have a more mild case of CF.