Table 2. Item-response model parameters and item importance Table 2. Item-response model parameters and item importance Table 2. Item-response model parameters and item importance Table 2. Item-response model parameters and item importance Table 2. Item-response model parameters and item importance Table 2. Item-response model parameters and item importance Table 2. Item-response model parameters and item importance
Item (j) Item description aj bj1 bj2 bj3 bj4 Info (%)
1 Speech 0.83 0.00 3.52 26.20 NE 2.3
2 Facial expression 1.07 -1.82 1.00 3.42 6.73 4.3
3 Rigidity - Neck 1.05 -0.12 1.51 4.06 6.61 3.8
4 Rigidity - RUE 0.42 -2.61 1.29 7.31 17.46 0.7
5 Rigidity - LUE 1.34 -0.36 1.04 3.49 7.91 5.6
6 Rigidity - RLE 0.59 0.11 2.51 6.04 11.43 1.3
7 Rigidity - LLE 1.29 0.43 1.66 3.55 6.53 5.0
8 Finger Tapping Right Hand 0.58 -1.68 1.49 4.65 9.78 1.4
9 Finger Tapping Left Hand 1.98 -0.44 0.85 2.15 4.01 11.7
10 Hand movements - Right Hand 0.63 -0.79 2.21 5.15 10.96 1.6
11 Hand movements - Left Hand 2.09 -0.14 1.15 2.47 4.38 12.3
12 Pronation-Supination - Right Hand 0.44 -1.10 2.88 7.09 14.26 0.8
13 Pronation-Supination - Left Hand 1.68 -0.15 1.26 2.64 4.83 8.6
14 Toe tapping - Right foot 0.59 -1.07 2.20 5.41 10.37 1.4
15 Toe tapping - Left foot 1.55 -0.47 0.99 2.51 4.75 7.9
16 Leg agility - Right leg 0.72 0.43 3.34 6.23 10.24 1.9
17 Leg agility - Left leg 1.55 0.28 1.78 3.33 5.32 7.2
18 Arising from chair 1.05 1.84 3.76 5.10 7.28 2.9
19 Gait 0.92 -0.65 2.94 5.31 7.93 3.0
20 Freezing of gait 1.28 3.63 4.73 5.82 6.25 2.5
21 Postural stability 0.82 2.90 4.21 5.06 7.80 1.6
22 Posture 0.88 -0.50 2.24 4.56 7.40 2.9
23 Global spontaneity of movement 1.39 -1.60 0.52 2.42 6.61 6.2
24 Postural tremor - Right Hand -0.04 -18.09 -63.61 -104.71 -226.18 0.005
25 Postural tremor - Left hand 0.45 2.22 6.94 11.43 NE 0.7
26 Kinetic tremor - Right hand 0.20 4.76 16.26 31.23 NE 0.1
27 Kinetic tremor - Left hand 0.55 1.70 5.75 12.07 16.75 1.0
28 Rest tremor amplitude - RUE -0.20 -1.68 -4.86 -11.24 -33.68 0.1
29 Rest tremor amplitude - LUE 0.46 1.86 3.71 7.61 19.63 0.7
30 Rest tremor amplitude - RLE -0.15 -12.99 -20.95 -33.81 -67.76 0.03
31 Rest tremor amplitude - LLE 0.20 10.91 16.82 28.54 NE 0.07
32 Rest tremor amplitude - Lip/jaw 0.32 8.40 13.05 20.88 NE 0.1
33 Constancy of rest tremor 0.06 -8.62 6.60 18.30 37.40 0.02
Parameter definitions: aj: discrimination parameter; bj1 to bj4: difficulty parameters. RUE, right upper extremity; LUE, left upper extremity; RLE, right lower extremity; LLE, left lower extremity. NE: not estimated, due to lack of data in the corresponding category. Info: information. Bolded are the most informative items, each contributing >5% information. In italics are the least informative items, each contributing to <1% information. Parameter definitions: aj: discrimination parameter; bj1 to bj4: difficulty parameters. RUE, right upper extremity; LUE, left upper extremity; RLE, right lower extremity; LLE, left lower extremity. NE: not estimated, due to lack of data in the corresponding category. Info: information. Bolded are the most informative items, each contributing >5% information. In italics are the least informative items, each contributing to <1% information. Parameter definitions: aj: discrimination parameter; bj1 to bj4: difficulty parameters. RUE, right upper extremity; LUE, left upper extremity; RLE, right lower extremity; LLE, left lower extremity. NE: not estimated, due to lack of data in the corresponding category. Info: information. Bolded are the most informative items, each contributing >5% information. In italics are the least informative items, each contributing to <1% information. Parameter definitions: aj: discrimination parameter; bj1 to bj4: difficulty parameters. RUE, right upper extremity; LUE, left upper extremity; RLE, right lower extremity; LLE, left lower extremity. NE: not estimated, due to lack of data in the corresponding category. Info: information. Bolded are the most informative items, each contributing >5% information. In italics are the least informative items, each contributing to <1% information. Parameter definitions: aj: discrimination parameter; bj1 to bj4: difficulty parameters. RUE, right upper extremity; LUE, left upper extremity; RLE, right lower extremity; LLE, left lower extremity. NE: not estimated, due to lack of data in the corresponding category. Info: information. Bolded are the most informative items, each contributing >5% information. In italics are the least informative items, each contributing to <1% information. Parameter definitions: aj: discrimination parameter; bj1 to bj4: difficulty parameters. RUE, right upper extremity; LUE, left upper extremity; RLE, right lower extremity; LLE, left lower extremity. NE: not estimated, due to lack of data in the corresponding category. Info: information. Bolded are the most informative items, each contributing >5% information. In italics are the least informative items, each contributing to <1% information. Parameter definitions: aj: discrimination parameter; bj1 to bj4: difficulty parameters. RUE, right upper extremity; LUE, left upper extremity; RLE, right lower extremity; LLE, left lower extremity. NE: not estimated, due to lack of data in the corresponding category. Info: information. Bolded are the most informative items, each contributing >5% information. In italics are the least informative items, each contributing to <1% information. Parameter definitions: aj: discrimination parameter; bj1 to bj4: difficulty parameters. RUE, right upper extremity; LUE, left upper extremity; RLE, right lower extremity; LLE, left lower extremity. NE: not estimated, due to lack of data in the corresponding category. Info: information. Bolded are the most informative items, each contributing >5% information. In italics are the least informative items, each contributing to <1% information.