Determining Risk Factors That Affect Progression in Patients with Nonproliferative Diabetic Retinopathy

Table 8

Probability of transitioning to proliferative diabetic retinopathy within 1, 4, and 7 years.

From	Probability to PDR (%)	95% confidence interval
Within 1 year
No retinopathy	0.7	(0.46–31.05)
Mild NPDR	3.5	(2.14–6.16)
Moderate NPDR	5.0	(3.29–8.26)
Severe NPDR	19.3	(14.26–26.17)
Within 4 years
No retinopathy	8.0	(6.26–63.78)
Mild NPDR	16.0	(12.06–23.89)
Moderate NPDR	24.1	(18.62–32.58)
Severe NPDR	56.4	(44.88–68.68)
Within 7 years
No retinopathy	20.6	(16.99–73.40)
Mild NPDR	30.8	(24.95–41.64)
Moderate NPDR	43.6	(35.02–54.08)
Severe NPDR	76.4	(64.24–86.74)

NPDR = nonproliferative diabetic retinopathy; PDR = proliferative diabetic retinopathy.