Regular Chinese Green Tea Consumption Is Protective for Diabetic Retinopathy: A Clinic-Based Case-Control Study

Table 4

Multivariate analysis on the associations of regular Chinese green tea consumption and other potential risk factors with diabetic retinopathy.

		Odds ratio	95% Confidence interval
Regular Chinese green tea consumption	Ever versus never	0.48	0.24, 0.97	0.04
Education	Formal versus no formal education	1.26	0.65, 2.43	0.50
Body mass index	Per unit increase	1.02	0.93, 1.12	0.62
Systolic blood pressure	Per mmHg increase	1.02	1.00, 1.05	0.05
Smoking history	Ever versus never	0.83	0.37, 1.85	0.64
Alcohol drinking	Ever versus never	1.29	0.52, 3.21	0.59
Duration of diabetes	Per year increase	1.07	1.01, 1.14	0.02
Insulin therapy	Ever versus never	0.73	0.33, 1.62	0.44
Family history of diabetes	Present versus absent	2.35	1.03, 5.35	0.04
Physical activity	Often versus rare	0.85	0.45, 1.62	0.64
Fasting blood glucose	Per mmol/L increase	0.93	0.80, 1.07	0.29