Table 1.

The prevalence of childhood allergies and symptoms among six Chinese cities.

Symptoms	Prevalence (%)
	Total	Harbin	Dalian	Beijing	Shanghai	Wuhan	Changsha
	(n = 912)	(n = 127)	(n = 120)	(n = 150)	(n = 205)	(n = 170)	(n = 140)
Persistent cough	2.2	2.36	0.8	2	2	2.4	3.6
	(n = 20)	(n = 3)	(n = 1)	(n = 3)	(n = 4)	(n = 4)	(n = 5)
Persistent phlegm	2	2.36	1.7	2	2	2.4	1.4
	(n = 18)	(n = 3)	(n = 2)	(n = 3)	(n = 4)	(n = 4)	(n = 2)
Respiratory allergy	8.8	5.51	9.2	0.7	12.2	12.9	10
	(n = 80)	(n = 7)	(n = 11)	(n = 1)	(n = 25)	(n = 22)	(n = 14)
Pollinosis	32.6	29.13	32.5	22	37.6	36.5	35
	(n = 297)	(n = 37)	(n = 39)	(n = 33)	(n = 77)	(n = 62)	(n = 49)
Past allergic diseases	41	43.31	38.3	28	50.7	43.5	37.9
	(n = 374)	(n = 55)	(n = 46)	(n = 42)	(n = 104)	(n = 74)	(n = 53)
Current allergies	36.4	32.28	35.8	25.3	42.9	39.4	38.6
	(n = 332)	(n = 41)	(n = 43)	(n = 38)	(n = 88)	(n = 67)	(n = 54)
Past allergies	46.7	43.31	55	41.3	50.7	50.6	37.9
	(n = 426)	(n = 55)	(n = 66)	(n = 62)	(n = 104)	(n = 86)	(n = 53)
Eczema	14	11.02	10.8	10.7	19	16.5	12.9
	(n = 128)	(n = 14)	(n = 13)	(n = 16)	(n = 39)	(n = 28)	(n = 18)