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

Table 6

Average sojourn time (±SD) and the effect on HbA1c for each stage.

Stage	Average sojourn time (years)	When HbA1c increased by 1 per year
		% sojourn time reduction	Years of sojourn time reduction
No retinopathy	3.03 (±0.97)	15	0.46
Mild NPDR	4.63 (±1.21)	10	0.47
Moderate NPDR	6.18 (±1.45)	7	0.46
Severe NPDR	4.85 (±1.25)	10	0.47

NPDR = nonproliferative diabetic retinopathy; SD = standard deviation.