. Author manuscript; available in PMC: 2017 Apr 1.

Published in final edited form as: Ophthalmic Epidemiol. 2016 Mar 7;23(2):88–93. doi: 10.3109/09286586.2015.1119287

Table 3.

Logistic regression analysis to study the effect of risk factors for proliferative diabetic retinopathy controlling for age, sex and site in African American participants, USA

Variable	Univariate analysis		Multivariate analysis
Variable	OR (95% CI)	P value	OR (95% CI)	P value
Duration of diabetes^*	1.58 (1.31–1.91)	<0.001	1.62 (1.28–2.03)	<0.001
Hemoglobin A_1C	1.31 (1.10–1.55)	0.002	1.04 (0.88–1.23)	0.68
Systolic blood pressure^†	1.47 (1.27–1.70)	<0.001	1.65 (1.37–1.97)	<0.001
Insulin treatment	6.63 (3.71–11.8)	<0.001	6.65 (3.33–13.3)	<0.001

OR, odds ratio; CI, confidence interval

OR calculated per 5 year increase in duration of diabetes

^†

OR calculated per 10mmHg increase in systolic blood pressure