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. 2001 Apr 23;2001(2):CD003098. doi: 10.1002/14651858.CD003098

1. Methodological quality of trials.

Methodological item Adequate Inadequate
Generation of random sequence. Computer‐generated sequence, random‐number tables, lot drawing, coin tossing, shuffling cards, throwing dice. Case number, date of birth, date of admission, alternation.
Concealment of allocation. Central randomization, coded drug boxes, sequentially sealed opaque envelopes. Open allocation sequence, any procedure based on inadequate generation.