Table 7. Comparison of association between conjunctival V and D in venules between C and DR subjects in unadjusted (Model 1) and adjusted (Model 2) models.

	Slope (s−1)	95% CI	P-value*
Model 1: DR Stage Effect
C	18a	16–21	Ref
NDR	18a	16–19	0.6
NPDR	22a	20–23	0.01b
PDR	21a	19–23	0.1
Model 2: DR Stage Effect			P-value**
C	18a	16–21	Ref
NDR	18a	16–19	0.5
NPDR	22a	20–23	0.01b
PDR	21a	19–23	0.1

Slopes of the regression lines relating V and D are provided. C, NDR, NPDR, and PDR are abbreviations for non-diabetic control, no clinically visible diabetic retinopathy, non-proliferative diabetic retinopathy, and proliferative diabetic retinopathy, respectively. Bold indicates statistical significance.

^aSignificant association between V and D.

^bAssociation between V and D significantly different than C (ref).

*Unadjusted.

**Adjusted for age, race, sex, mean arterial pressure, heart rate, hematocrit, and hemoglobin A1C.