Comparison of flicker ERG parameters in control group and NDR group
| Parameters | Control group (n=62) | NDR group (n=66) | P value |
| 16 Tds | |||
| Implicit time (ms) | 28.70±1.64 | 29.98±1.87 | <0.001** |
| Amplitude (μV) | 20.09±6.08 | 17.36±5.35 | 0.008** |
| 32 Tds | |||
| Implicit time (ms) | 27.79±1.51 | 29.03±1.71 | <0.001** |
| Amplitude (μV) | 24.20±6.75 | 20.89±5.75 | 0.003** |
| Pupil area ratio | 2.03±0.38 | 1.85±0.28 | 0.003** |
| DR score | 17.89±2.96 | 19.25±2.19 | 0.004** |
*P<0.05; **P<0.01.
DR, diabetic retinopathy; ERG, electroretinography; NDR, patients with diabetes without clinically detectable retinopathy.