Outcomes	Reported in paper (circle)
Primary outcomes
Outcome 1—Mortality of children in postoperative period	Yes/No
Outcome 2—Risk of assisted ventilation (including mask ventilation, laryngeal mask airway and intubation) after extubation	Yes/No
Outcome 3—Risk of drug‐related adverse effects	Bradycardia/Salivation/Vomiting/Others
Secondary outcomes
Outcome 1—Risk of postoperative residual neuromuscular block: We defined residual neuromuscular block as TOF ratio < 0.9 in acceleromyography (mechanomyography or electromyography)	Yes/No
Outcome 2—Time between neostigmine or placebo administration and TOF ratio recovery to 0.9	Yes/No
Outcome 3—Risk of hypoxia after extubation	Yes/No
Outcome 4—Length of stay in PACU	Yes/No
Subgroups	Reported in paper
Definition of residual neuromuscular block
Muscle relaxant
Length of surgery
Age	Neonate/Younger than 3 years old/Older than 3 years old
Race	White/Black/Yellow