Table 1

	Atypical parkinsonism (N=10) MEAN±SD	PD(N=20)MEAN±SD	t	P value
H & Y	2.750±0.3536	2.825±0.5911	0.368	0.716
MDS-UPDRS	81.40±23.277	73.30±27.488	0.798	0.432
PIGD	8.30±4.218	7.45±5.206	0.447	0.658
FOGQ	13.10±5.259	10.35±6.133	1.210	0.236
BBS	35.50±8.017	37.95±13.736	0.519	0.608

Table 1: Comparison of clinical scoring in subgroups of PD and atypical parkinsonism

^*-statistically significant

Table 2

		H & Y STAGEMEAN ± SD	p value	UPDRS SUM SCOREMEAN ± SD	p value
Freezing	present (N=19)	2.95±.55	0.038^*	83.21±25.27	0.044^*
	Absent (N=11)	2.55±.35		63.55±23.42
Postural Instability	present (N=27)	2.89±.47	0.003^*	79.30±25.13	0.035^*
	Absent (N=3)	2.00±.00		46.33±12.66
Fall	present (N=5)	3.20±.45	0.057	96.00±25.81	0.058
	Absent (N=25)	2.72±.50		72.00±24.67

Table 2: Disease severity scores- H and Y stage and MDS-UPDRS and PI symptoms

^*-statistically significant

Table 3

PARAMETER / DURATION OF FREEZING	(NEVER)MEAN ± SD (ms)(N=9)	(1–2 S)MEAN ± SD (ms)(N=8)	(3–10 S)MEAN ± SD (ms)(N=9)	(11–30 S)MEAN ± SD (ms)(N=3)	(MORE THAN 30 S) MEAN ± SD (ms)(N=1)	SPEARMAN COEFFICIENT	P VALUE
N75 RIGHT	77.11±17.59	74.13±10.65	69.00±14.00	74.67±16.50	78.00	-0.156	0.411
N75 LEFT	78.11±17.50	76.25±8.730	65.00±6.538	69.33±7.572	77.00	-0.335	0.070
P100 RIGHT	114.11±16.811	108.88±6.06	107.33±11.874	104.67±6.35	105.00	-0.307	0.099
P100 LEFT	114.67±16.439	110.25±6.86	103.89±11.73	106.67±8.96	105.00	-0.426	0.019*
N145 RIGHT	154.78±21.742	143.75±9.07	144.44±11.50	135.00±22.91	158.00	-0.286	0.121
N145 LEFT	153.56±18.96	147.00±14.68	148.78±11.63	143.33±14.57	159.00	-0.125	0.511
I RIGHT	1.88±.32	1.64±.31	1.49±.14	1.70±.70	1.60	-0.348	0.060
I LEFT	1.71±.34	1.74±.36	1.57±.41	2.30±.26	1.60	0.117	0.536
II RIGHT	2.68±.27	2.75±.27	2.49±.13	2.43±.81	2.40	-0.262	0.163
II LEFT	2.90±.45	2.77±.17	2.53±.43	2.97±.30	2.40	-0.216	0.252
III RIGHT	3.58±.35	3.87±.27	3.51±.13	3.23±.72	3.30	-0.277	0.139
III LEFT	3.94±.40	3.79±.36	3.48±.44	3.80±.10	3.70	-0.326	0.079
IV RIGHT	4.60±.52	5.00±.39	4.58±.34	4.40±.69	4.30	-0.142	0.454
IV LEFT	4.88±.53	4.90±.54	4.74±.30	4.93±.35	4.70	-0.109	0.568
V RIGHT	5.52±.43	5.95±.67	5.50±.60	5.33±.38	5.20	-0.180	0.342
V LEFT	5.71±.36	5.80±.60	5.81±.50	5.77±.21	5.40	-0.043	0.820
I-III IPL RIGHT	1.70±.34	2.11±.43	2.02±.20	1.50±.36	1.70	0.071	0.709
I-III IPL LEFT	2.24±.40	2.05±.39	1.92±.33	1.47±.15	2.10	-0.447	0.013*
III-V IPL RIGHT	1.97±.18	2.10±.58	1.96±.54	2.10±.35	1.90	-0.042	0.825
III-V IPL LEFT	1.77±.26	2.01±.53	2.34±.53	1.97±.11	1.70	0.377	0.040*
N20 RIGHT	19.57±2.29	19.45±4.08	20.87±3.16	25.83±1.15	17.80	0.273	0.144
N20 LEFT	20.62±2.18	21.65±2.45	21.89±3.68	19.13±1.80	16.40	-0.144	0.449
P22 RIGHT	23.17±3.15	23.20±5.93	24.14±3.44	26.23±5.44	20.30	0.122	0.522
P22 LEFT	24.09±2.76	25.30±3.38	25.33±3.17	24.90±1.90	20.10	0.019	0.923
P37 RIGHT	38.22±8.30	39.74±2.55	41.04±5.59	31.803.36	40.70	-0.052	0.784
P37 LEFT	37.78±6.14	38.97±3.18	37.53±4.34	36.50±4.7	38.60	-0.183	0.334
N45 RIGHT	45.25±7.50	46.64±3.36	46.81±4.56	36.77±5.01	45.40	-0.195	0.302
N45 LEFT	44.36±6.40	46.84±3.51	42.96±5.01	41.23±5.26	46.30	-0.201	0.287

Table 3: Evoked potentials and association with duration of freezing

^*-statistically significant

Table 4

PARAMETERS	PIGD (0-5)MEAN ± SD (ms) (N=14)	PIGD (6-10)MEAN ± SD (ms)(N=6)	PIGD (11-15)MEAN ± SD (ms)(N=8)	PIGD (15-20)MEAN ± SD (ms)(N=2)	SPEARMAN COEFFICIENT	p value
N75 RIGHT	74.14±16.56	75.00±6.45	73.25±15.37	68.00±14.14	-0.030	0.876
N75 LEFT	75.29±15.84	74.83±8.52	67.12±6.91	71.50±7.78	-0.188	0.320
P100 RIGHT	110.21±14.63	113.00±8.46	107.00±9.914	103.00±2.83	-0.207	0.271
P100 LEFT	110.43±13.60	113.67±12.88	105.00±10.156	103.00±2.83	-0.350	0.058
N145 RIGHT	148.71±16.58	152.50±17.44	140.13±15.113	144.00±19.80	-0.270	0.149
N145 LEFT	148.21±17.55	155.17±12.43	148.00±12.201	148.00±15.56	-0.025	0.897
I RIGHT	1.81±.28	1.58±.35	1.50±.4106	1.650±.070	-0.483	0.007*
I LEFT	1.68±.34	1.58±.50	1.90±.4209	1.850±.35	0.231	0.219
II RIGHT	2.73±.28	2.57±.16	2.42±.4334	2.60±.28	-0.379	0.030*
II LEFT	2.87±.35	2.52±.53	2.73±.30119	2.65±.35	-0.207	0.273
III RIGHT	3.76±.30	3.52±.34	3.39±.4121	3.50±.28	-0.487	0.006*
III LEFT	3.83±.37	3.67±.71	3.65±.2070	3.70±.00	-0.213	0.258
IV RIGHT	4.85±.52	4.57±.25	4.46±.4897	4.55±.35	-0.342	0.064
IV LEFT	4.95±.47	4.75±.58	4.77±.3012	4.65±.07	-0.138	0.467
V RIGHT	5.87±.59	5.42±.32	5.31±.5489	5.40±.28	-0.418	0.022*
V LEFT	5.95±.53	5.53±.32	5.66±.2774	5.50±.14	-0.221	0.241
I-III IPL RIGHT	1.88±.26	1.93±.65	1.89±.4121	1.80±.14	0.059	0.758
I-III IPL LEFT	2.16±.41	2.12±.377	1.72±.2915	1.85±.35	-0.424	0.019*
III-V IPL RIGHT	2.16±.43	1.80±.179	1.92±.5418	1.90±.00	-0.235	0.212
III-V IPL LEFT	2.11±.58	1.90±.518	2.01±.229	1.80±.14	-0.103	0.589
N20 RIGHT	19.75±3.66	18.95±1.48	22.47±2.999	22.40±6.51	0.358	0.050*
N20 LEFT	21.16±2.69	20.70±1.93	21.47±3.817	18.70±3.25	-0.107	0.574
P22 RIGHT	23.26±4.95	22.60±2.98	24.86±3.405	25.15±6.86	0.180	0.341
P22 LEFT	24.44±2.87	24.43±1.73	25.89±3.835	23.05±4.17	0.063	0.741
P37 RIGHT	40.10±6.18	37.13±4.19	39.31±6.849	34.35±8.98	-0.255	0.174
P37 LEFT	38.80±5.70	37.22±3.06	37.325±3.457	36.30±3.25	-0.308	0.098
N45 RIGHT	46.70±5.85	43.28±2.61	45.933±6.105	38.20±10.18	-0.292	0.117
N45 LEFT	44.91±6.13	44.92±4.22	43.238±4.681	43.15±4.45	-0.202	0.284

Table 4: Evoked potentials and association with PIGD scores

^*-statistically significant

Table 5

PARAMETERS	FOGQ (0-10)MEAN ± SD (ms)(N=15)	FOGQ (11-20)MEAN ± SD (ms)(N=13)	FOGQ (>20)MEAN ± SD (ms)(N=2)	SPEARMAN COEFFICIENT	p value
N75 RIGHT	75.93±15.36	71.92±13.00	68.00±14.14	-0.194	0.305
N75 LEFT	76.60±14.72	68.54±8.36	71.50±7.78	-0.248	0.186
P100 RIGHT	113.33±11.90	105.92±11.54	103.00±2.83	-0.357	0.053
P100 LEFT	113.20±11.44	105.38±12.83	103.00±2.83	-0.425	0.019*
N145 RIGHT	153.07±13.03	140.15±17.70	144.00±19.80	-0.380	0.038*
N145 LEFT	152.67±15.46	146.15±14.17	148.00±15.56	-0.221	0.241
I RIGHT	1.83±.29	1.48±.34	1.65±.07	-0.465	0.010*
I LEFT	1.73±.37	1.71±.45	1.85±.35	0.174	0.357
II RIGHT	2.73±.27	2.47±.35	2.60±.28	-0.322	0.083
II LEFT	2.78±.21	2.72±.55	2.65±.35	-0.139	0.465
III RIGHT	3.75±.30	3.43±.37	3.50±.28	-0.391	0.033*
III LEFT	3.83±.35	3.65±.49	3.70±.00	-0.211	0.263
IV RIGHT	4.89±.38	4.44±.50	4.55±.35	-0.228	0.226
IV LEFT	4.88±.51	4.83±.37	4.65±.07	-0.068	0.722
V RIGHT	5.79±.57	5.41±.54	5.40±.28	-0.275	0.141
V LEFT	5.81±.48	5.75±.45	5.50±.14	-0.069	0.717
I-III IPL RIGHT	1.85±.36	1.95±.44	1.80±.14	0.057	0.767
I-III IPL LEFT	2.10±.33	1.94±.48	1.85±.35	-0.401	0.028*
III-V IPL RIGHT	2.09±.40	1.93±.49	1.90±.00	-0.130	0.493
III-V IPL LEFT	1.99±.41	2.10±.57	1.80±.14	0.362	0.050*
N20 RIGHT	19.38±3.28	21.48±3.16	22.40±6.51	0.362	0.050*
N20 LEFT	21.26±2.69	21.02±3.09	18.70±3.25	-0.067	0.724
P22 RIGHT	23.05±4.64	24.18±3.59	25.15±6.86	0.213	0.258
P22 LEFT	24.31±2.60	25.48±3.32	23.05±4.17	0.130	0.493
P37 RIGHT	38.08±5.55	40.64±6.27	34.35±8.98	-0.075	0.694
P37 LEFT	37.73±5.21	38.39±3.94	36.30±3.25	-0.083	0.664
N45 RIGHT	45.03±5.28	46.58±5.64	38.20±10.18	-0.125	0.509
N45 LEFT	44.71±6.06	44.11±4.39	43.15±4.45	-0.124	0.513

Table 5: Evoked potentials and association with FOGQ scores

^*-statistically significant

Table 6

PARAMETERS	BBS (41-56)MEAN ± SD (ms)(N=14)	BBS (21-40)MEAN ± SD (ms)(N=14)	BBS (0-20)MEAN ± SD (ms)(N=2)	SPEARMAN COEFFICIENT	p value
N75 RIGHT	75.50±15.75	71.71±11.90	74.50±23.33	-0.134	0.481
N75 LEFT	77.21±15.41	69.43±7.59	65.00±1.41	-0.326	0.078
P100 RIGHT	112.71±12.16	107.36±11.69	101.00±.00	-0.318	0.087
P100 LEFT	113.21±11.87	106.14±12.44	101.50±.71	-0.387	0.035*
N145 RIGHT	151.71±12.04	145.50±17.90	122.50±10.61	-0.323	0.082
N145 LEFT	151.50±15.46	149.64±14.42	135.00±2.83	-0.149	0.433
I RIGHT	1.78±.33	1.61±.31	1.35±.49	-0.427	0.019*
I LEFT	1.69±.34	1.71±.46	2.15±.07	0.155	0.415
II RIGHT	2.77±.25	2.51±.18	2.15±.92	-0.484	0.007*
II LEFT	2.81±.19	2.67±.53	2.80±.14	-0.231	0.219
III RIGHT	3.84±.22	3.42±.18	3.05±.92	-0.726	0.001*
III LEFT	3.81±.29	3.66±.52	3.75±.07	-0.286	0.125
IV RIGHT	4.95±.35	4.46±.40	4.20±.85	-0.534	0.002*
IV LEFT	4.88±.43	4.82±.48	4.75±.21	-0.159	0.400
V RIGHT	5.89±.52	5.36±.50	5.25±.49	-0.549	0.002*
V LEFT	5.84±.44	5.69±.48	5.65±.07	-0.198	0.295
I-III IPL RIGHT	1.99±.37	1.81±.39	1.65±.35	-0.266	0.155
I-III IPL LEFT	2.14±.35	1.95±.43	1.55±.07	-0.419	0.021*
III-V IPL RIGHT	2.07±.44	1.92±.43	2.20±.42	-0.092	0.629
III-V IPL LEFT	2.02±.40	2.04±.58	1.90±.00	-0.058	0.760
N20 RIGHT	19.24±3.37	20.99±3.09	25.85±1.62	0.424	0.020*
N20 LEFT	21.06±2.68	21.17±3.18	19.20±2.55	-0.057	0.763
P22 RIGHT	22.84±4.66	24.33±3.56	25.00±7.07	0.204	0.280
P22 LEFT	23.99±2.59	25.29±3.48	26.00±.00	0.254	0.176
P37 RIGHT	39.09±5.17	39.94±6.56	30.50±3.54	-0.239	0.203
P37 LEFT	37.89±5.27	37.94±3.86	38.00±5.66	-0.057	0.763
N45 RIGHT	45.79±5.08	46.09±5.68	35.50±6.36	-0.262	0.162
N45 LEFT	44.84±6.10	43.98±4.43	43.50±4.95	-0.148	0.435

Table 6: Evoked potentials and association with BBS

^*-statistically significant

Table 7

PARAMETERS	Atypical parkinsonismMEAN ± SD (ms)(N=10)	PDMEAN ± SD (ms)(N=20)	t	p value
N75 RIGHT	71.00± 17.192	75.00± 12.448	0.730	0.471
N75 LEFT	72.50± 17.044	72.90± 9.668	0.082	0.935
P100 RIGHT	109.00± 13.266	109.65±11.394	0.140	0.890
P100 LEFT	109.60±17.989	108.90±8.602	0.146	0.885
N145 RIGHT	147.50±19.398	146.55±15.066	0.148	0.883
N145 LEFT	150.70±15.514	148.95±14.709	0.302	0.765
I RIGHT	1.55±0.347	1.73±0.328	1.391	0.175
I LEFT	1.700±0.4422	1.745±0.3832	0.288	0.775
II RIGHT	2.59±0.191	2.62±0.376	0.197	0.845
II LEFT	2.90±0.42	2.67±0.36	1.581	0.125
III RIGHT	3.54±0.23	3.62±0.42	0.562	0.578
III LEFT	3.77±0.35	3.73±0.44	0.280	0.781
IV RIGHT	4.55±0.48	4.73±0.47	0.979	0.336
IV LEFT	4.93±0.33	4.80±0.48	0.769	0.449
V RIGHT	5.53±0.60	5.64±0.56	0.473	0.640
V LEFT	5.88±0.45	5.70±0.44	1.041	0.307
I-III IPL RIGHT	1.99±0.46	1.84±0.34	1.049	0.303
I-III IPL LEFT	2.09±0.55	1.98±0.32	0.730	0.471
III-V IPL RIGHT	1.92±0.53	2.06±0.38	0.807	0.427
III-V IPL LEFT	2.10±0.59	1.99±0.41	0.622	0.539
N20 RIGHT	21.60±2.51	19.94±3.81	1.243	0.224
N20 LEFT	21.91±3.38	20.53±2.54	1.260	0.218
P22 RIGHT	25.12±2.81	22.96±4.67	1.340	0.191
P22 LEFT	25.57±3.17	24.32±2.89	1.085	0.287
P37 RIGHT	40.44±5.26	38.15± 6.45	0.970	0.340
P37 LEFT	38.70±3.89	37.54± 4.82	0.663	0.513
N45 RIGHT	46.67±4.79	44.53± 6.33	0.938	0.356
N45 LEFT	43.95±4.98	44.55±5.36	0.296	0.770