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. 2012 Mar 14;2012(3):CD005315. doi: 10.1002/14651858.CD005315.pub2

Ferguson 2004.

Methods  
Participants  
Interventions  
Outcomes  
Notes See Table 8
Risk of bias
Bias Authors' judgement Support for judgement
Random sequence generation (selection bias) Unclear risk "Subjects were randomly assigned." Method of randomisation not described.
Allocation concealment (selection bias) Unclear risk Not described.
Blinding (performance bias and detection bias) 
 Subjective outcomes High risk Patients aware of group allocation.
Blinding (performance bias and detection bias) 
 Objective outcomes Low risk Vital signs measurement automated.
Incomplete outcome data (attrition bias) 
 All outcomes Unclear risk Withdrawals, drop‐outs, and missing data not described.
Selective reporting (reporting bias) High risk Insufficient data provided for extraction: Anxiety, HR, BP, and RR.
Protection from contamination? Unclear risk Interventions administered on an individual basis.