. 2018 Sep 27;18:134. doi: 10.1186/s12871-018-0601-x

Table 2.

Overall cough rates and degree of cough

	Group R	Group C	P
The overall occurrence of cough	9(34.62%)	20(76.92%)	0.002^a
Total number of patients according to cough grade
Grade 0	17	6	0.002^a
Grade 1	6	7	0.749
Grade 2	1	9	0.005^a
Grade 3	2	4	0.358

Categorical variables were presented as numbers and percentage, quantitative variables were shown as means and standard deviation. ASA American Society of Anesthesiologists. Group R: the patients were recieved 6 ml of 0.75% ropivacaine for throat, glottic area and tracheal mucosa uniform spray; Group C: the patients were recieved with 6 ml of saline for throat, glottic area and tracheal mucosa uniform spray as control. ^a Compared GroupR with Group C, P < 0.05