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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)