Table 2 The Jadad score

Generation of allocation sequence

 0 no double-blinding

 2 computer-generated random numbers

Description of withdrawals and drop-outs

 1 not described

 1 numbers and reasons are described

Allocation concealment

 0 numbers and reasons are not described

 3 central randomization

 Efficacy of randomization

 2 sealed envelopes or similar

 2 pre-treatment variables in tabular from

 1 not described or inadequate

 1 balance of pre-treatment variables

Investigator blindness

 1 balance of pre-treatment variables mentioned but not in tabular form

 2 identical placebo tables or similar

 0 no information report

 1 inadequate or not described