Table 3.

Mean values and standard deviations (SD) of N200 and P300 parameters in HT patients depending on their age.

Age	20–39 years			40–59 years			> 60 years
No of patients	HT (n = 26)	CG (n = 17)	p-value	HT (n = 30)	CG (n = 18)	p-value	HT (n = 12)	CG (n = 10)	p-value
	Mean (SD)	Mean (SD)		Mean (SD)	Mean (SD)		Mean (SD)	Mean (SD)
Latency (ms)
N200 Fz	231.3 (31.9)	204.1 (19.1)	< 0.001	249.3 (30.5)	212.8 (20.5)	< 0.001	272.6 (35.2)	223.0 (17.3)	< 0.001
Cz	231.6 (31.9)	201.4 (17.4)	< 0.001	248.0 (29.4)	213.7 (20.7)	< 0.001	270.2 (34.3)	225.1 (18.1)	0.001
Pz	233.7 (30.0)	202.7 (18.3)	< 0.001	247.8 (31.5)	214.1 (18.3)	< 0.001	267.9 (32.4)	225.1 (17.5)	0.001
P300 Fz	338.7 (21.8)	312.8 (19.8)	< 0.001	354.5 (17.3)	323.4 (19.9)	< 0.001	372.1 (18.6)	340.5 (14.4)	< 0.001
Cz	337.9 (20.6)	313.8 (19.6)	< 0.001	355.5 (16.7)	324.7 (24.2)	< 0.001	374.7 (19.5)	339.6 (13.5)	< 0.001
Pz	341.5 (19.8)	318.1 (22.5)	< 0.001	355.3 (16.9)	325.2 (24.7)	< 0.001	374.5 (24.7)	340.9 (11.8)	< 0.001
Amplitude (uV)
N200 Fz	4.68 (3.72)	5.17 (2.95)	0.65	2.88 (1.76)	3.11 (1.51)	0.65	2.58 (1.97)	3.56 (2.23)	0.28
Cz	4.14 (2.85)	4.24 (3.61)	0.92	2.95 (1.65)	2.83 (1.51)	0.81	2.89 (1.56)	3.16 (1.35)	0.68
Pz	3.31 (2.73)	3.34 (2.78)	0.96	2.80 (1.87)	2.67 (0.99)	0.80	2.76 (1.53)	3.24 (1.10)	0.42
P300 Fz	5.65 (2.83)	9.86 (4.75)	< 0.001	6.03 (4.58)	6.12 (2.56)	0.96	5.41 (2.93)	8.39 (2.87)	0.02
Cz	5.38 (2.44)	9.96 (4.56)	< 0.001	6.15 (4.91)	6.31 (2.53)	0.89	4.90 (2.48)	7.65 (2.35)	0.01
Pz	4.81 (2.57)	10.2 (4.43)	< 0.001	5.76 (4.55)	6.85 (2.63)	0.94	3.68 (2.33)	7.5 (2.18)	< 0.001

CG control group, HT Hashimoto’s thyroiditis, SD standard deviation, Fz frontal region, Cz central region, Pz parietal region.