Prevalence of adult eczema, hay fever, and asthma, and associated risk factors: a population-based study in the northern Grassland of China

Table 1 Demographic characteristics of the eczema and EAH study population

Variables	Eczema			EAH			Total
Variables	No (n = 1766)	Yes (n = 330)	P	No (n = 1989)	Yes (n = 107)	P	Total
Age (years), mean ± SD	47.94 ± 14.85	43.32 ± 14.02	0.001	48.22 ± 13.89	44.99 ± 13.65	< 0.001	47.71 ± 13.90
Gender, n (%)			0.698			0.312
Male	713 (83.9)	137 (16.1)		812 (95.5)	38 (4.5)		850 (40.6)
Female	1053 (84.5)	193 (15.5)		1177 (94.5)	69 (5.5)		1246 (59.4)
Ethnicity, n (%)			0.811			0.645
Han	1050 (84.3)	195 (15.7)		1182 (94.9)	63 (5.1)		1245 (59.4)
Mongolian	649 (84.4)	120 (15.6)		731 (95.1)	38 (4.9)		769 (36.7)
Other	67 (81.7)	15 (18.3)		76 (92.7)	6 (7.3)		82 (3.9)
Residence, n (%)			< 0.001			< 0.001
Rural	857 (80.6)	206 (19.4)		988 (92.9)	75 (7.1)		1063 (50.8)
Urban	907 (88.0)	124 (12.0)		999 (96.9)	32 (3.1)		1031 (49.2)
Education level, n (%)^a			< 0.001			< 0.001
Low	457 (90.5)	48 (9.5)		496 (98.2)	9 (1.8)		505 (24.1)
Medium	796 (86.3)	126 (13.7)		893 (96.9)	29 (3.1)		922 (44.1)
High	511 (76.7)	155 (23.3)		598 (89.8)	68 (10.2)		666 (31.8)
Marital status, n (%)^b			0.411			0.307
Unmarried	120 (80.5)	29 (19.5)		138 (92.6)	11 (7.4)		149 (7.2)
Married	1601 (84.6)	291 (15.4)		1801 (95.2)	91 (4.8)		1892 (90.9)
Divorced/widowed	35 (85.4)	6 (14.6)		38 (92.7)	3 (7.3)		41 (2.0)
Annual family income (CNY, mean ± SD)^c	5.1 ± 4.0	5.7 ± 5.3	0.007	5.1 ± 4.1	6.5 ± 4.6	0.001	5.2 ± 4.2
BMI^d, n (%)			0.608			0.409
Lean or healthy	873 (83.7)	170 (16.3)		983 (94.2)	60 (5.8)		1043 (49.8)
Overweight	696 (86.3)	129 (15.6)		788 (95.5)	37 (4.5)		825 (39.4)
Obese	196 (86.3)	31 (13.7)		217 (95.6)	10 (4.4)		227 (10.8)
Family history, n (%)			< 0.001			< 0.001
Positive	579 (32.8)	147 (44.5)		663 (33.3)	63 (58.9)		726 (35.7)
Negative	1187 (67.2)	183 (55.4)		1326 (66.7)	44 (41.1)		1310 (64.3)

^aEducation was categorized as low (received only primary education or no education), medium (finished secondary school or high school) and high (graduated from college or university). Education status was missing in 3 cases in this study
^bMarital status was missing in 14 cases
^cFamily income was calculated as 10,000 RMB/year/ family
^dBMI was categorized according to the World Health Organization criteria, with BMI < 25 kg/m² defined as lean or healthy, BMI between 25 and 29 kg/m² defined as overweight, and BMI ≥ 30 kg/m² defined as obese. BMI status was missing in 1 case

ISSN: 1710-1492