Table 1.

Databases and search strategies

Database	Search strategy
PubMed	(Spinal Cord Injuries[mh] OR “Spinal cord injury” OR “spinal cord injuries” OR “spinal cord injured” OR “spinal injury” OR “spinal injuries” OR “cervical spine injury” OR “cervical spine injuries” OR “CS injury”)AND (Sleep Apnea Syndromes[mh] OR Hypoventilation[mh] OR Respiratory Insufficiency[mh] OR Polysomnography[mh] OR “sleep apnea” OR “sleep apneas” OR “Sleep Disordered Breathing” OR “Sleep Hypopneas” OR “sleep hypopnea” OR hypoventilation OR Hypoventilations OR “Respiratory Insufficiency” OR “Respiratory Failure” OR “Respiratory Depression” OR “Ventilatory Depression” OR Polysomnography OR Polysomnographies OR “sleep monitoring” OR Somnography OR Somnographies OR “sleep studies” OR “sleep study”) Filters activated: English
Cochrane Library	ID line #  Search strategy #1  MeSH descriptor: [Spinal Cord Injuries] explode all trees #2  ("Spinal cord injury" or "spinal cord injuries" or "spinal cord injured" or "spinal injury" or "spinal injuries" or "cervical spine injury" or "cervical spine injuries" or "CS injury") #3  MeSH descriptor: [Sleep Apnea Syndromes] explode all trees #4  MeSH descriptor: [Hypoventilation] explode all trees #5  MeSH descriptor: [Respiratory Insufficiency] explode all trees #6  MeSH descriptor: [Polysomnography] explode all trees #7  ("sleep apnea" or "sleep apneas" or "Sleep Disordered Breathing" or "Sleep Hypopneas" or "sleep hypopnea" or hypoventilation or Hypoventilations or "Respiratory Insufficiency" or "Respiratory Failure" or "Respiratory Depression" or "Ventilatory Depression" or Polysomnography or Polysomnographies or "sleep monitoring" or Somnography or Somnographies or "sleep studies" or "sleep study") #8  #1 or #2     #9  #3 or #4 or #5 or #6 or #7   #10  #8 and #9
CINAHL	(MH "Spinal Cord Injuries+" OR MH "Spinal Cord Injury Nursing" OR TX "Central Cord Syndrome" OR TX "Spinal Cord Compression" OR TX "Spinal cord injury" OR TX "spinal cord injuries" OR TX "spinal cord injured" OR TX "spinal injury" OR TX "spinal injuries" OR TX "cervical spine injury" OR TX "cervical spine injuries" OR TX "CS injury") AND (MH "Sleep Apnea Syndromes+" OR MH "Hypoventilation+" OR MH "Respiratory Failure+" OR MH "Polysomnography" OR TX "sleep apnea" OR TX "sleep apneas" OR TX "Sleep Disordered Breathing" OR TX "Sleep Hypopneas" OR TX "sleep hypopnea" OR TX hypoventilation OR TX Hypoventilations OR TX "Respiratory Insufficiency" OR TX "Respiratory Failure" OR TX "Respiratory Depression" OR TX "Ventilatory Depression" OR TX Polysomnography OR TX Polysomnographies OR TX "sleep monitoring" OR TX Somnography OR TX Somnographies OR TX "sleep studies" OR TX "sleep study") Limiters - English Language; Exclude MEDLINE records
Web of Science	Topic = (“Spinal cord injury” OR “spinal cord injuries” OR “spinal cord injured” OR “spinal injury” OR “spinal injuries” OR “cervical spine injury” OR “cervical spine injuries” OR “CS injury”) AND Topic = (“sleep apnea” OR “sleep apneas” OR “Sleep Disordered Breathing” OR “Sleep Hypopneas” OR “sleep hypopnea” OR hypoventilation OR Hypoventilations OR “Respiratory Insufficiency” OR “Respiratory Failure” OR “Respiratory Depression” OR “Ventilatory Depression” OR Polysomnography OR Polysomnographies OR “sleep monitoring” OR Somnography OR Somnographies OR “sleep studies” OR “sleep study”) Timespan = 1970-01-01 - 2013-03-14. Databases = SCI-EXPANDED, SSCI, A&HCI, CPCI-S.