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Table 2 Overview of emergent upper and lower level categories

From: Perceptions of adult trauma patients on the acceptability of text messaging as an aid to reduce harmful drinking behaviours

Upper level categories Lower level categories
Appeal of the proposed intervention Important issue
  Evidence based
  Readiness for change
  Targeted
Barriers and enablers to participation Ease of use
  Frequency of messages
  Respondent burden
Delivery of the intervention Deliverer
  Text messaging features
  Timing
Intervention content Tone of the message
  Message ideas
  Cultural relevance
  Privacy and confidentiality