0.01-0.05

Subclinical

• Influence/effects not apparent or obvious
• Behavior nearly normal by ordinary observation
• Impairment detectable by special tests

0.03-0.12

Euphoria

• Mild euphoria, sociability, talkativeness
• Increased self-confidence; decreased inhibitions
• Diminution of attention, judgment and control
• Some sensory-motor impairment
• Slowed information processing
• Loss of efficiency in critical performance tests

0.09-0.25

Excitement

• Emotional instability; loss of critical judgment
• Impairment of perception, memory and comprehension
• Decreased sensatory response; increased reaction time
• Reduced visual acuity, peripheral vision and glare recovery
• Sensory-motor uncoordination; impaired balance
• Drowsiness

0.18-0.30

Confusion

• Disorientation, mental confusion; dizziness
• Exaggerated emotional states (fear, rage, grief, etc.)
• Disturbances of vision (diplopia, etc.) and of perception of color, form, motion, dimensions
• Increased pain threshold
• Increased muscular uncoordination; staggering gait; slurred speech
• Apathy, lethargy

0.25-0.40

Stupor

• General inertia; approaching loss of motor functions
• Markedly decreased response to stimuli
• Marked muscular uncoordination; inability to stand or walk; vomiting; incontinence of urine and feces
• Impaired consciousness; sleep or stupor

• Complete unconsciousness; coma; anesthesia
• Depressed or abolished reflexes
• Subnormal temperature
• Impairment of circulation and respiration
• Possible death

• Death from respiratory arrest