How is fev1 calculated?

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  1. #first
  2. #ratio
  3. #result
  4. #obstructive
  5. #measured
  6. #institute
  7. #calculate
  8. #reading
  9. #second
  10. #during
  11. #doctor
  12. #present
  13. #percent
  14. #value
  15. #according
  16. #indicates
  17. #divides
  18. #disease