Table 3.

Characteristics of people with DR depending on the severity of DR.

Parameter	Mild NPDR	Moderate NPDR	Severe NPDR	PDR	p *
HbA1c (%) b	7.1 [7; 7.45]	8 [7.5; 8.6]	8 [7.45; 8.2]	8.9 [8; 9.1]	<0.0001
DM duration (years) b	8 [5; 10]	5 [3; 11.5]	15.5 [12.5; 20]	20 [15; 23]	<0.0001
Age (years) b	68 [60.5; 72]	69 [58.2; 75.7]	64.5 [56; 70.5]	64.5 [60; 73]	0.51

Notes: Numerical variables with non-Gaussian distribution are indicated by their median (interquartile range); Results are presented as median (interquartile range). p-value was calculated using Kruskal–Wallis test. Abbreviations: HbA1C, haemoglobin A1c; DM, diabetes mellitus; NPDR, nonproliferative diabetic retinopathy. ^b Continuous variable; * ANOVA: Kruskal-Wallis test.