Table 1 Cough symptom scores for daytime and night time.

Score	Daytime	Night time
0	No cough during the day	No cough during the night
1	Cough for one short period	Cough on waking only
2	Cough for more than two short periods	Wake once or early due to cough
3	Frequent coughing which did not interfere with usual daytime activities	Frequent waking due to coughs
4	Frequent coughing which did interfere with usual daytime activities	Frequent coughs most of the night
5	Distressing cough most of the day	Distressing cough most of the night