Table 1.

Original and modified Minogue scales and outcomes categorization for the primary outcome analysis

Outcomes categorization	Grade and severity description	Modified Minogue scale To be used for our analysis	Original Minogue scale 3-point Likert scale
None to mild	Grade 1 (none)	No coughing or muscular stiffness
	Grade 2 (mild)	Coughing once or twice, or transient cough response to removal of tracheal tube that resolved with extubation	Single cough
Moderate to severe	Grade 3 (moderate)	≤ 3 coughs lasting 1~2 s, or total duration of coughing last ≤ 5 s	More than one episode of non-sustained coughing lasting ≤ 5 s
	Grade 4 (severe)	≥4 coughs with each lasting > 2 s, total duration of coughing last > 5 s	Sustained coughing of more than 5 s duration