Study ID
Identification
Field	Value
Sponsorship source
Country
Setting
Comment
Author's name
Institution
Email
Address
Study design
Field	Value
Study Design
Group
Participants
Field	Value
Inclusion Criteria
Exclusion Criteria
Baseline characteristics
Characteristics	Nitrous oxide ‐ free ‐ A	Nitrous oxide ‐ based ‐ A	Nitrous oxide ‐ free ‐ B	Nitrous oxide‐based ‐ B
Number randomized
Number analysed
Age (mean)
% male
Type of surgery
Other information
Intervention characteristics
Characteristics	Nitrous oxide ‐ free ‐ A	Nitrous oxide ‐based
Induction
Maintenance
Recovery
Other drugs used
Premedication
Name
Pre‐treatment
Field	Value
Group Differences