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Table 2 Risk of bias and funding source

From: Spinal cord stimulation in the treatment of refractory angina: systematic review and meta-analysis of randomised controlled trials

  Random sequence generation Concealment of randomisation Blinding Loss to follow up/drop out Method of data analysis Jadad score (/5) Funding
DeJongste 1994 Not stated Independent telephone service Open label 8% Not stated 2 Government
DiPede 2001 Not stated Not stated Blinded ECG assessment 0% Not stated 3 Not stated
ESBY 1998 Not stated Not stated Open label 7%* Intention to treat 2 Government
Hauvast 1998 Not stated Not stated Open label 0% Not stated 2 Government
Jessurum 1999 Not stated Not stated Open label 0% Not stated 2 Industry
SPiRiT 2006 Computer-generated Independent R&D department Open label 9% Intention to treat 4 Industry
Eddicks 2007 Not stated Not stated Double blind 0% Not stated 4 Industry
  1. *: at 6-months follow up