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Table 2 Risk of bias in the selected studies

From: The Alexander Technique and musicians: a systematic review of controlled trials

Study

Described as randomised

Randomisation method described and appropriate

Assessor unaware of group allocation of subjects

Description of withdrawals and drop-outs

Score[[15, 16]]

AT teacher

Doyle 1984 [24]

Yes

Yes

No

Yes

3

Author

Dennis 1987 [25]

Yes

No

Yes

Yes

3

7 certified AT teachers (not including author)

Valentine et al. 1995 [26]

Yes

No

Yes

Yes

3

2 teachers employed for the study

Lorenz 2002 [27]

Yes

No

Yes (questionnaires)

Yes

3

Author (without professional certification in AT)

Egner and Gruzelier 2003 [28]

Yes

No

Yes

No

2

Not described

Valentine and Williamon 2003 [29]

Yes

No

Yes

No

2

Qualified AT teacher

Mozeiko 2011 [30]

Yes

Yes

Yes (questionnaires)

Yes

4

9 certified AT teachers

Barlow 1956 [31]

No

-

No

No

0

Author (AT teacher)

Armstrong 1975 [32]

No

-

No

Yes

1

Author (qualified AT teacher)

Nielsen 1988 [33]

No

-

Yes

Yes

2

Professional AT teacher

Engelhart 1989 [34]

No

-

Yes

Yes

2

Certified AT teacher

Hoberg 2008 [35]

No

-

Yes (questionnaires)

No

1

Author (not a registered AT teacher)