Table 2: Quality of study McShane, et al.

Support for judgement Review authors' judgement
Selection bias: Random sequence generation Method not described. Not randomized choice High bias probability
Selection bias: Allocation concealment Recall of patients treated some years before, with similar characteristics, in 2006 for needling plus corticost inj and in 2008 only for needling High bias probability
Performance bias No blinding of the patient referred to the treatment is described High bias probability
Detection bias No blinding of outcome assessors is described High bias probability
Attrition bias No patients outcomes attrition or exclusion are described.
All the patient who received the procedure have an outcomes reported
Low bias probability
Reporting bias No selective outcomes reporting are present Low bias probability
Other sources of bias No Low bias probability