Ghaly 1988.

Methods	Study design: randomized parallel groups Study dates: not stated
Participants	Country: England Sex: female Age: 28 Procedure: elective caesarean section for cephalopelvic disproportion Study size: 50
Interventions	Randomized portion of anaesthetic: parts of volatile agent Intervention 1: maintenance: halothane 0.5%, N = 25 Intervention 2: maintenance: Isoflurane 0.75%, N = 25
Outcomes	Primary outcomes: anaesthesia recovery, APGAR scores, blood gases Secondary outcome: awareness/wakefulness as defined using an awareness classification system (see Table 1): class 1 Comment: none of the mothers complained of intraoperative dreams or awareness
Notes	Non‐randomized portion of anaesthetic: parts of volatile agent N2O yes/narcotics/hypnotics bolus/muscle relaxants induction yes/maintenance yes Anaesthesia induction: thiopentone (3 mg to 5 mg/kg) + suxamethonium 100 mg. Anaesthesia maintenance: 50:50 N2O:O2 + group‐specific volatile agent; post‐delivery: alfentaniI 1.0 mg IV/N2O 70%/suxamethonium 0.1% rate just sufficient to abolish diaphragmatic movement Time of outcome determination: first postoperative day Method of outcome determination: interview No email address available for ROB survey
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "They were randomly allocated to either the isoflurane or halothane group"
Allocation concealment (selection bias)	Unclear risk	Comment: no information provided
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Comment: anaesthesiologist: no information provided
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Comment: assessor: no information provided
Incomplete outcome data (attrition bias) All outcomes	Low risk	Comment: no missing outcome data
Selective reporting (reporting bias)	Low risk	Comment: awareness outcome part of inclusion criteria
Other bias	Unclear risk	Comment: insufficient information provided