Table 3.

Binary Logistic regression of AD and related factors.

	OR	95% CI	p
Age	1.022	1.009–1.035	0.001
Disease duration	1.036	1.018–1.053	<0.001
Gender
Male	1.0 (ref.)
Female	0.894	0.758–1.055	0.183
Latitude
20–25°N	1.0 (ref.)
25–30°N	0.733	0.511–1.051	0.091
30–35°N	0.821	0.637–1.059	0.129
35–40°N	0.858	0.655–1.122	0.263
40–45°N	0.352	0.241–0.514	<0.001
Clinically suspected bacterial infection
No	1.0 (ref.)
Yes	3.532	2.779–4.489	<0.001

Thirty-nine hospitals were divided into 5 groups based on their latitude: (i) 20°01′–25°N, Guangdong Province; (ii) 25°01′–30°N, Chongqing, Hunan, and Jiangxi Provinces; (iii) 30°01′–35°N, Henan, Zhejiang, Shanghai, Hubei, Jiangsu, Anhui, and Shanxi Provinces; (iv) 35°01′–40°, Beijing, Tianjin, and Shandong Province; and (v) 40°01′–45°N, Liaoning Province.