Results
cough
GROUP B
According to the inclusion and exclusion criteria, a total of 459 children were recruited in this study, 153 in each group. Among them, Group A: 3 children were crying and difficult to persuade before surgery, and 9 children with cough symptoms before surgery were excluded, a total of 141 children were included; Group B: 4 children were crying and difficult to persuade before surgery, and 7 children with cough symptoms before surgery were excluded, a total of 142 children were included; Group C: 2 children were crying and difficult to persuade before surgery, and 11 children with cough symptoms before surgery were excluded, a total of 140 children were included, as shown in Fig. Flow Chart