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Table 1Categories of reporting method

Adequate sequence generation
  • Coin toss, throwing a dice, shuffling, drawing lots (from a container).
    Partial drawing a card from a pack.
  • Computer or calculator generated sequence (including minimisation and biased-coin/urn design). Partial: “random permuted blocks”.
  • Random number table or statistical tables. Partial: random numbers, randomisation table.
  • Randomised Latin square design.
Inadequate sequence generation
  • For example, allocation by alteration, birthdate, day of week.
Adequate allocation concealment
  • Central randomisation: with contacting details and/or statement that central office retained schedule; must apply to all patients. Partial: vague statement of central randomisation.
  • Independent third party: allocates interventions and retains schedule, or statement that allocator has no knowledge of patients. Partial: third party, but unclear treatment allocation.
  • Third party cluster randomisation: third party has no knowledge of clusters.
    Partial: unclear what third party knew.
  • Different parties (including one of the authors): should have no knowledge of the patients and retain schedule.
  • Secure computer assisted method, e.g. locked file. Partial: as adequate, but unclear access.
  • Sequentially numbered, opaque, sealed envelopes – all required, else partial.
  • Serially numbered, identical containers, allocated sequentially – all required, else partial.
Inadequate allocation concealment
  • For example, schedule known in advance, birthdate, case record number.

From: 5, METHODS USED TO DEVELOP THE GUIDELINE

Cover of The Management of Inadvertent Perioperative Hypothermia in Adults
The Management of Inadvertent Perioperative Hypothermia in Adults [Internet].
NICE Clinical Guidelines, No. 65.
National Collaborating Centre for Nursing and Supportive Care (UK).
Copyright © 2008, National Collaborating Centre for Nursing and Supportive Care.

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