Ooi 1992.

Methods	Design: single‐blind, prospective randomized controlled trial Country: UK Multisite: no International: no Treatment duration: perioperative period Follow‐up: not specified Operative procedure(s): therapeutic abortion Randomization unit: participants Analysis unit: individual
Participants	30 participants enrolled ASA I to II female participants aged 18 to 39 undergoing ambulatory therapeutic abortion of pregnancy before 14 weeks gestation No exclusion criteria were provided. Randomized to: group I (n = 15, 50%); group II (n = 15 50%); 1 patient from group II was excluded because they were unable to complete required psychomotor testing. Main characteristics of participants: age (mean, range): group II 24.5 years, 18 to 33; group II 27.2 years, 18 to 39; number of females/males: 30/1.
Interventions	Supplemental fluid group (intervention): preoperative bolus of 20 mL/kg 4% glucose/0.18% saline solution Conservative fluid group (control): no preoperative bolus Co‐interventions: none stated
Outcomes	Nausea was assessed using a questionnaire. Nausea severity was recorded on a 4‐point scale: 1 = none; 2 = slight; 3 = moderate; 4 = severe. This was completed during PACU stay and reported as a dichotomous outcome. Also assessed on the postoperative questionnaire, using the same scale, were anxiety, pain, drowsiness, headache, dizziness, thirst, sore throat, weakness, and muscle ache. Psychomotor testing used a 4‐choice, computer‐controlled visual reaction time test and a letter cancellation test was completed preoperatively and postoperatively. Scores were reported for both periods. Also measured were time to eye opening, time until able to obey commands, and time until able to state date of birth, and biochemical measurements including serum glucose, plasma osmolality, and urine osmolality.
Notes	Trial registration: not stated Funder: not stated A priori sample size estimation: stated on page 576 Conducted: dates not stated Declared conflicts of interest: not stated
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Participants were randomly allocated, but no information on the randomization process was provided.
Allocation concealment (selection bias)	Unclear risk	Participants were randomly allocated, but no information on the randomization process was provided.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	It is not stated that participants or personnel were blind to group allocation.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	All postoperative testing was completed by a blinded observer.
Incomplete outcome data (attrition bias) All outcomes	Low risk	One participant was excluded. This was explained in the text.
Selective reporting (reporting bias)	Low risk	All outcomes were reported.
Other bias	Low risk	There were no other sources of bias.