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. 2016 May 23;2016(5):CD000938. doi: 10.1002/14651858.CD000938.pub2

LIBBY 1998.

Study characteristics
Methods Randomised controlled trial carried out in two centres in the UK.
Participants 59 women (30 induction; 29 await spontaneous labour) with a fetus estimated above the 97th percentile (abdominal circumference, estimated fetal weight according to Chitty 1994).
Interventions Immediate induction of labour using either oxytocin or prostaglandins. Women in the expectant management group: labour was induced at 42 completed weeks of gestation.
Outcomes Mode of delivery, birthweight, delay and adverse maternal or neonatal outcome.
Notes No adverse fetal or maternal outcome. Standard deviation estimated from the information available (interquartile ranges).
Risk of bias
Bias Authors' judgement Support for judgement
Random sequence generation (selection bias) Low risk Table of random numbers generated by computer.
Allocation concealment (selection bias) Low risk Sealed opaque, consecutively‐numbered envelopes.
Blinding of participants and personnel (performance bias)
All outcomes High risk It was not feasible to blind women or clinical staff to treatment allocation and lack of blinding may have affected clinical management and outcomes.
Blinding of outcome assessment (detection bias)
All outcomes High risk Not reported; it is likely that outcome assessment was not blinded.
Incomplete outcome data (attrition bias)
All outcomes Low risk 29/30 women in the induction group had induction, compared to 14/29 in the expectant management group; analysis was however performed on an intention‐to‐treat basis.
Selective reporting (reporting bias) Unclear risk Not possible to tell ‐ unpublished data.
Other bias Unclear risk Unclear.