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

McRee 2003.

Methods  
Participants  
Interventions  
Outcomes  
Notes See Table 8
Risk of bias
Bias Authors' judgement Support for judgement
Random sequence generation (selection bias) Low risk “Participants then were assigned to one of the four groups by drawing of lots.”
Allocation concealment (selection bias) Unclear risk Not described.
Blinding (performance bias and detection bias) 
 Subjective outcomes High risk Participants aware of group assignment.
Blinding (performance bias and detection bias) 
 Objective outcomes Low risk Automated measurement of BP and HR.
Incomplete outcome data (attrition bias) 
 All outcomes Unclear risk Withdrawals and drop‐outs not described.
Selective reporting (reporting bias) Low risk Appears to report on all major outcomes.
Protection from contamination? Low risk Interventions administered on an individual basis.