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Table 1 Risk of bias of the included randomised clinical trials (9-item Cochrane checklists for randomised trials

From: Criteria in diagnosing nocturnal leg cramps: a systematic review

  Randomisation Concealed randomization Blinded patients Blinded treaters Blinded Assessors Groups comparable Loss to follow up Intention to treat Groups treated equaly
Connolly 1992 [29] 6/9 + - + + - - + + +
Coppin 2005 [5] 8/9 + + - + + + + + +
Garrison 2011 [17] 9/9 + + + + + + + + +
Hallegraeff 2012 [9] 9/9 + + + + + + + + +
Jansen 1997 [18] 9/9 + + + + + + + + +
Roffe 2002 [19] 8/9 + + + + - + + + +
Serrao 2001 [14] 3/9 + - - - - - + - +
Young 1993 [15] 1/9 - - ? ? ? ? - ? +
  1. Coppin 2005 [5], Garrison 2011 [17], Hallegraeff 2012 [9], Jansen 1997 [18] and Roffe 2002 [19] showed low risk of bias