Table 1

Quality criteria of the randomized controlled trials assessed

Reference

Randomization

Sample size determination

Drop outs

Intention to treat analysis

Blinding

Allocation concealment


Kitchell 1963 [17]

Not described (nor stated)

Not described

33% of the treatment group upon cross-over

No

Allegedly participants blinded, but impossible to adequately assess

Unclear

Olszewer 1990 [18]

Described

Not described

None

Yes

Initially double blinded but code was broken after 10 treatments and study was completed with single blind for remaining 10 treatments

Unclear

Sloth-Nielsen 1991 [19]

Described

Not described

None

Yes

Double

Unclear

Guldager 1992 [16]

Described

Not described

4 drop outs by 3 months; 30 drop outs by 6 months

No

Double: code broken at 3 months

Unclear

Guldager 1993 [15]

Not described

Not described

Not mentioned

No

Double

Unclear

Van Rij 1994 [20]

Described

Yes

None

Yes

Double

Unclear

Knudtson 2002 [4]

Described

Yes

4 in placebo, 2 in treatment group

Yes

Double

Well described


Seely et al. BMC Cardiovascular Disorders 2005 5:32   doi:10.1186/1471-2261-5-32

Open Data