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Table 2 Five categories of the ASIA impairment scale

From: Neurological outcome after emergency radiotherapy in MSCC of patients with non-small cell lung cancer - a prospective trial

A Complete. No sensory or motor function
  is preserved in the sacral segments S4-S5.
B Sensory Incomplete. Sensory but not
  motor function is preserved below the
  neurological level and includes the sacral
  segments S4-S5 (light touch, pin prick at S4-S5:
  or deep anal pressure (DAP)), and no motor
  function is preserved more than three levels below
  the motor level on either side of the body.
C Motor Incomplete. Motor function is
  preserved below the neurological level, and
  more than half of key muscle functions below the
  single neurological level of injury (NLI) have a
  muscle grade less than 3 (Grades 0–2).
D Motor Incomplete. Motor function is
  preserved below the neurological level, and at
  least half (half or more) of key muscle functions
  below the NLI have a muscle grade > 3.
E Normal. If sensation and motor function
  are graded as normal in all segments, and the
  patient had prior deficits, then the AIS grade is E.