daze vs persistent vegetative state

daze

noun
  • The state of being dazed 

  • A glittering stone. 

verb
  • To stun or stupefy, for example with bright light, with a blow, with cold, or with fear 

persistent vegetative state

noun
  • A condition of patients with severe brain damage in whom coma has progressed to a state of wakefulness without awareness. 

How often have the words daze and persistent vegetative state occurred in a corpus of books? (source: Google Ngram Viewer )