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

Lidwell 1971.

Methods  
Participants  
Interventions  
Outcomes  
Notes See Table 17
Risk of bias
Bias Authors' judgement Support for judgement
Random sequence generation (selection bias) Unclear risk Method of allocation not described (likely to be rule‐based, e.g. room availability).
Allocation concealment (selection bias) High risk Unlikely to have allocation concealment, as likely to have a rule‐based allocation system.
Blinding (performance bias and detection bias) 
 Subjective outcomes Unclear risk Level of blinding not described.
Blinding (performance bias and detection bias) 
 Objective outcomes Unclear risk Level of blinding not described.
Incomplete outcome data (attrition bias) 
 All outcomes Unclear risk Withdrawals and drop‐outs not described.
Selective reporting (reporting bias) High risk Insufficient data provided for extraction: Infection.
Protection from contamination? Unclear risk Unclear if patients were moved between rooms.