Comparative analysis of pattern visual evoked potentials according to the type of diabetes mellitus in patients in different diabetic retinopathy stages

Figures & data

Table 1. Distribution of the patients according to the type of DM, the mean age and the duration of DM.

Groups		Number of patients (N)	Mean age	Duration of DM
Controls		47	38.6 ± 12.4	0
Newly-diagnosed DM	type 1	18	36. 4 ± 12.1	<1 year
	type 2	16	45.6 ± 12.3	<1 year
DM without DR, DM duration > 1 year	type 1	12	39 ± 13.9	10.2 ± 7.8
	type 2	23	45.6 ± 4	6.8 ± 4.2
DM with initial DR	type 1	11	41.3 ± 11.6	13 ± 11.2
	type 2	23	50.1 ± 12.9	9.8 ± 6.2
DM with advanced DR	type 1	17	42.2 ± 14.4	15.6 ± 9.6
	type 2	18	53.6 ± 8.5	11.6 ± 12.3

Table 2. Comparative analysis of PVEPs L values between both types of DM at 15° group with newly-diagnosed DM.

				DM type 1 (N = 18)		DM type 2 (N = 16)		Р
Electrode position	Component	Side of stimulation	Stimulus	$\overline{\text{X}}$	SD	$\overline{\text{X}}$	SD
O1-Fz	N75	Left	15°	84.00	5.05	88.12	5.53	0.033
	P100			109.28	4.16	114.27	8.49	0.051
	N145			147.89	15.13	155.94	18.19	0.169
Oz-Fz	N75	Left	15°	84.85	3.99	90.80	5.40	0.012
	P100			109.71	4.66	117.20	7.26	0.002
	N145			150.83	13.47	160.56	20.25	0.105
O2-Fz	N75	Left	15°	85.08	4.11	90.19	6.92	0.017
	P100			108.72	5.07	115.27	7.70	0.006
	N145			149.00	16.47	159.63	17.60	0.078
O1-Fz	N75	Right	15°	84.51	6.64	92.59	7.06	0.002
	P100			110.21	6.49	115.50	7.24	0.018
	N145			148.83	11.35	166.19	17.63	0.002
Oz-Fz	N75	Right	15°	84.92	5.38	93.59	6.57	<0.001
	P100			110.71	4.91	117.60	7.22	0.004
	N145			154.94	12.35	164.94	18.48	0.084
O2-Fz	N75	Right	15°	84.94	5.07	93.07	7.60	<0.001
	P100			109.67	4.46	116.33	8.07	0.009
	N145			154.67	14.21	167.38	17.59	0.026

$\overline{\text{X}},$ mean; SD, standard deviation.

Table 3. Comparative analysis of PVEPs A values between both types of DM at 15° group with newly-diagnosed DM.

				DM type 1 (N = 18)		DM type 2 (N = 16)		Р
Electrode position	Component	Side of stimulation	Stimulus	$\overline{\text{X}}$	SD	$\overline{\text{X}}$	SD
Oz-Fz	N75-P100	Left	15°	9.86	4.63	7.57	4.24	0.144
	P100-N145			9.31	4.57	6.82	3.87	0.099
	N145-P200			5.88	3.10	3.67	2.10	0.022
Oz-Fz	N75-P100	Right	15°	9.22	5.07	7.08	3.39	0.164
	P100-N145			9.59	5.45	6.14	2.95	0.028
	N145-P200			5.96	3.95	3.15	1.93	0.013

$\overline{\text{X}},$ mean; SD, standard deviation.

Figure 1. PVEPs L values in sagittal, IPSI and CROSS electrode positions in DM type 1 and type 2 at 15° group without DR, DM duration >1 year. *Р<0.05, **Р<0.01, ***Р<0.005 and ****Р<0.001.

Figure 2. PVEPs A values in sagittal, IPSI and CROSS electrode positions in DM type 1 and type 2 at 15° group without DR, DM duration >1 year. *Р<0.05, **Р<0.01, ***Р<0.005 and **** Р< 0.001.

Figure 3. PVEPs L values in sagittal, IPSI and CROSS electrode positions in DM type 1 and type 2 at 15° group with initial DR. *Р < 0.05, **Р < 0.01, ***Р < 0.005 and ****Р < 0.001.

Figure 4. Percentage distribution of the number of different PVEPs values between patients with type 1 and type 2 DM in the different groups.