Parkinson’s Disease Gravity Index: A Method by means of Optimal Scaling

Table 2

Transformation with the OS.

			“Corrected value of each interval” by the OS	Minimum absolute value	“Corrected value of each interval” by the OS	Maximum	Corrected value multiplied by the factor	Maximum
AD	1	36–49	−1.85	1.85	0		0
	2	50–63	−0.79		1.06		2.91
	3	64–70	−0.6		1.25		3.43
	4	71–77	0.39		2.24		6.15
	5	78–84	1.54		3.39		9.3
	6	85–92	1.68		3.53	3.53	9.69	9.69
MD	1	3–16	−1.48	1.48	0		0
	2	17–23	−1.01		0.47		1.29
	3	24–30	−0.3		1.18		3.24
	4	31–44	0.9		2.38		6.53
	5	45–58	1.85		3.33	3.33	9.14	9.14
DD	1	0–1.5	−1.58	1.58	0		0
	2	1.51–3.01	−1.11		0.47		1.29
	3	3.02–4.52	−0.75		0.83		2.28
	4	4.53–7.54	0.2		1.78		4.88
	5	7.55–10.56	1.48		3.06		8.4
	6	10.57–12.07	2.25		3.83	3.83	10.51	10.51
AxD	1	0–1.75	−1.23	1.23	0		0
	2	1.76–3.51	−0.89		0.34		0.93
	3	3.52–7.03	−0.53		0.7		1.92
	4	7.04–8.79	0.47		1.7		4.67
	5	8.80–10.55	0.74		1.97		5.41
	6	10.56–12.31	1.72		2.95		8.1
	7	12.32–14.07	2.29		3.52	3.52	9.66	9.66
CD	1	16–27.125	−1.71	1.71	0		0
	2	27.126–49.377	−1		0.71		1.95
	3	49.378–60.503	−0.12		1.59		4.36
	4	60.504–71.629	0.66		2.37		6.5
	5	71.63–82.755	1.25		2.96		8.12
	6	82.756–93.881	1.39		3.1		8.51
	7	93.882–105.007	1.65		3.36	3.36	9.22	9.22
ApD	1	0–4.25	−1.21	1.21	0		0
	2	4.26–8.51	−0.81		0.4		1.1
	3	8.52–12.77	−0.31		0.9		2.47
	4	12.78–17.03	0.5		1.71		4.69
	5	17.04–21.29	0.56		1.77		4.86
	6	21.3–25.55	1.51		2.72		7.46
	7	25.56–34.07	1.53		2.74	2.74	7.52	7.52
FD	1	0–3.625	−1.33	1.33	0		0
	2	3.626–7.251	−0.8		0.53		1.45
	3	7.252–10.877	−0.03		1.3		3.57
	4	10.878–14.503	0.71		2.04		5.6
	5	14.504–18.129	0.88		2.21		6.06
	6	18.13–21.755	1.32		2.65		7.27
	7	21.756–25.381	1.97		3.3		9.06
	8	25.382–29.007	2.39		3.72	3.72	10.21	10.21
NMD	1	2–16.25	−1.29	1.29	0		0
	2	16.26–30.51	−0.53		0.76		2.09
	3	30.52–44.77	0.61		1.9		5.21
	4	44.78–101.81	1.47		2.76		7.57
	5	101.82–116.07	1.87		3.16	3.16	8.67	8.67
PsD	1	0–1	−0.68	0.68	0		0
	2	1.01–2.01	0.39		1.07		2.94
	3	2.02–4.03	1.1		1.78		4.88
	4	4.04–5.04	1.84		2.52		6.92
	5	5.05–8.07	3.89		4.57	4.57	12.54	12.54
SD	1	0–2.5	−1.52	1.52	0		0
	2	2.51–5.01	−0.81		0.71		1.95
	3	5.02–7.52	0		1.52		4.17
	4	7.53–12.54	0.62		2.14		5.87
	5	12.55–17.56	1.2		2.72		7.46
	6	17.57–20.07	3.16		4.68	4.68	12.84	12.84
Index factor creation (100/36.44 = 2.744)						36.44		100

AD: age dimension; MD: motor dimension; DD: depression dimension; AxD: anxiety dimension; CD: cognitive dimension; ApD: apathy dimension; FD: fatigue dimension; NMD: nonmotor dimension; PsD: psychosis dimension PsD; SD: sleep dimension.