Table 1

 Cough scoring system adapted from Hsu et al7

0No cough during the day0No cough during the night
1Cough for one short period1Cough on waking only
2Cough for more than two short periods2Wake once or early due to cough
3Frequent coughing, which did not interfere with usual daytime activities3Frequent waking due to coughs
4Frequent coughing, which did interfere with usual daytime activities4Frequent coughs most of the night
5Distressing cough most of the day5Distressing cough most of the night