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