Table 1– Age and sex distribution of patients presenting to cough clinics within each country

Country	Totals	Age group in years
Country	Totals	0–9	10–19	20–29	30–39	40–49	50–59	60–69	70–79	80–89	90–99	≥100
UK n=4792
Total		0.02	1.29	2.80	7.35	17.3	24.7	28.7	14.7	3.00	0.08	0.02
Female	65	100	53	55	61	68	65	64	65	67	75	0
Male	35	0	47	45	39	32	35	36	35	33	25	100
USA n=1000
Total		0.00	0.40	3.00	7.40	17.20	23.9	23.2	16.6	7.40	0.90	0.00
Female	70	0	50	57	59	70	69	75	74	64	89	0
Male	30	0	50	43	41	30	31	25	26	36	11	0
Holland n=1841
Total		0.00	1.74	2.34	7.77	15.5	26.5	26.7	15.6	3.75	0.16	0.00
Females	67	0	75	56	63	66	67	68	67	72	100	0
Males	33	0	25	44	37	34	33	32	33	28	0	0
Sweden n=389
Total		0.00	1.29	9.77	8.48	15.9	20.8	29.3	12.6	1.80	0.00	0.00
Females	67	0	60	79	45	69	62	73	65	86	0	0
Males	33	0	40	21	55	31	38	27	35	14	0	0
South Korea n=1518
Total		0.07	2.44	9.35	12.5	14.6	22.6	25.5	11.9	1.05	0.07	0.00
Female	69	0	35	47	63	76	75	74	67	44	100	0
Male	31	100	65	53	37	24	25	26	33	56	0	0
China n=492
Total		0.20	2.64	16.46	27.9	24.6	14.8	8.94	3.86	0.61	0.00	0.00
Females	51	100	46	38	49	50	74	52	42	33	0	0
Male	49	0	54	62	51	50	26	48	58	67	0	0

The data are presented as percentages.