Correlation between serum tocopherol level and retinal parameters at baseline.

Table 3: Correlation between serum tocopherol level and retinal parameters at baseline.

Retinal parameters at baseline	Serum tocopherol level at baseline
Retinal parameters at baseline	n	Correlation coefficient (r_s)	p-value
Retinal microhaemorrhages	39	- 0.627^**	< 0.001
Diabetic macular edema	22	- 0.430^*	0.046

Spearman's correlation (poor degree of agreement = 0.00-0.20, fair agreement = 0.21-0.40, moderate agreement = 0.41-0.60, strong agreement = 0.61-0.80, while near complete agreement = 0.81-1.00). Assumptions were fulfilled. **Significant at p < 0.001; *Significant at p < 0.05; n: number of patients.