Table 2.

Multivariable model of risk factors associated with acute gastrointestinal illness in the 4 weeks prior to interview in Gansu Province, northwest China, June 2012–May 2013

Variable	OR	95% CI	P-value
Age (years)			< 0.01
0–4	1.89	0.75–4.80	0.18
5–14	3.35	1.56–7.21	< 0.01
15–24	2.25	0.98–5.14	0.06
25–44	0.87	0.52–1.44	0.58
45–64	Ref.	Ref.	Ref.
≥ 65	1.17	0.58–2.36	0.66
Yearly household income (CNY)			< 0.01
0–19999	Ref.	Ref.	Ref.
20000–49999	2.34	1.29–4.25	< 0.01
≥ 50000	4.05	1.89–8.69	< 0.01
Sentinel site			< 0.01
Baiyin	0.10	0.04–0.25	< 0.01
Liangzhou	0.23	0.15–0.35	< 0.01
Qingcheng	Ref.	Ref.	Ref.

OR, Odds ratio; CI, Confidence interval; CNY, China Yuan.

Hosmer and Lemeshow test (p = 0.156).