Assertion: poisoning's symptom | /r/CapableOf | begin at this level of oxygen
Facets:
value: usually
type: TEMPORAL
value: after approximately 14 hours
type: TEMPORAL
Source sentences:
text: The earliest signs of pulmonary toxicity begin with evidence of tracheobronchitis, or inflammation of the upper airways, after an asymptomatic period between 4 and 22 hours at greater than 95% oxygen, with some studies suggesting symptoms usually begin after approximately 14 hours at this level of oxygen.