Clinical characteristics and drug utilisation patterns in patients with chronic cough: a retrospective cohort study using a Japanese claims database

Table 2 Cough diagnoses during the index month

Population	Population ‘All’	Population 1	Population 2	Other coughs	Cough-variant asthma	Atopic/allergic cough
Number of participants	N = 6,038	N = 3,500	N = 2,538	N = 1,444	N = 1,026	N = 105
Chronic cough	3,500 (58.0%)	3,500 (100%)	0	0	0	0
Cough associated with infection	185 (3.1%)	145 (4.1%)	40 (1.6%)	9 (0.6%)	8 (0.8%)	1 (1.0%)
Atopic cough / allergic cough	131 (2.2%)	31 (0.9%)	100 (3.9%)	5 (0.3%)	14 (1.4%)	100 (95.2%)*
Cough-variant asthma	1,131 (18.7%)	126 (3.6%)	1,005 (39.6%)	60 (4.2%)	1,003 (97.8%)*	17 (16.2%)
Postinfectious cough	58 (1.0%)	11 (0.3%)	47 (1.9%)	4 (0.3%)	4 (0.4%)	0
Other coughs	1,532 (25.4%)	125 (3.6%)	1,407 (55.4%)	1,407 (97.4%)*	47 (4.6%)	3 (2.9%)

^*These values are < 100% due to differences in how the subgroups and the cough diagnoses during the index month are assigned. In the subgroups, the definition was based on the presence of the relevant diagnostic cough code between the first diagnoses of cough (potentially six months prior to the index month) and the index month itself, while the cough diagnosis during the index month requires the presence of the relevant diagnostic cough code specifically during the index month

ISSN: 1471-2466