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. 2014 Oct 9;2014(10):CD005189. doi: 10.1002/14651858.CD005189.pub4

Field 1966.

Methods Randomised controlled trial
Participants Babies
Interventions Ampicillin
 Placebo
Outcomes Length of hospital stay
 Symptoms (not specified)
 Switch to treatment arm
 Death
Notes No deaths or apparent side effects reported from the use of ampicillin
Risk of bias
Bias Authors' judgement Support for judgement
Random sequence generation (selection bias) Low risk Randomised
Allocation concealment (selection bias) Unclear risk Risk unclear
Blinding (performance bias and detection bias) 
 All outcomes Low risk Patients were blinded but not doctors nor outcome assessors
Incomplete outcome data (attrition bias) 
 All outcomes High risk No intention‐to‐treat analysis but withdrawal rates were acceptable
Selective reporting (reporting bias) Low risk  
Other bias Unclear risk Funding sources do not appear to be identified. Beechams Research Laboratories supplied both the ampicillin and the placebo