Total | Retinopathy grading | p Value* | p Value† | ||||||
---|---|---|---|---|---|---|---|---|---|
0 | 1 | 2 | 3 | 4a | 4b | ||||
p Values indicate differences between retinopathy levels and possible trends across increasing levels. | |||||||||
*Differences between gradings were tested by Kruskal–Wallis one-way analysis of variance by ranks. | |||||||||
†Trend across increasing grading (excluding 4b) was tested by Jonckheere–Terpstra statistic. | |||||||||
Type 1 diabetes | |||||||||
n | 656 | 303 | 136 | 161 | 19 | 5 | 32 | ||
Mean (SD) visual acuity | 0.90 (0.2) | 1.00 | 1.00 | 0.90 | 0.90 | 0.60 | 0.80 | 0 | 0 |
Type 2 diabetes | |||||||||
n | 328 | 201 | 41 | 71 | 12 | 1 | 2 | ||
Mean (SD) visual acuity | 0.85 (0.3) | 0.90 | 0.80 | 0.80 | 0.80 | 0.50 | 0.65 | 0.005 | 0 |