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. 2013 May 6;13:127. doi: 10.1186/1471-244X-13-127

Table 6.

Transformation of VFT subtest scores

< Secondary school
≥ Secondary school
18-39
40-55
18-39
40-55
PD P z T IQ PD P z T IQ PD P z T IQ PD P z T IQ
0-4
1
< −1.79
< 32
< 73
0-1
1
< −1.79
< 32
< 73
0-6
1
< −1.74
< 33
< 74
0-3
1
< −2.22
< 28
< 67
0-4
1
< −1.79
< 32
< 73
2
1
−1.79
32
73
0-6
1
< −1.74
< 33
< 74
0-3
1
< −2.22
< 28
< 67
0-4
1
< −1.79
< 32
< 73
3
2
−1.63
34
76
0-6
1
< −1.74
< 33
< 74
0-3
1
< −2.22
< 28
< 67
0-4
1
< −1.79
< 32
< 73
4
5
−1.46
35
78
0-6
1
< −1.74
< 33
< 74
4
1
−2.22
28
67
5
1
−1.79
32
73
5
7
−1.30
37
80
0-6
1
< −1.74
< 33
< 74
5
1
−2.04
30
69
6
2
−1.6
34
76
6
10
−1.14
39
83
0-6
1
< −1.74
< 33
< 74
6
1
−1.86
31
72
7
5
−1.42
36
79
7
16
−0.98
40
85
7
1
−1.74
33
74
7
2
−1.68
33
75
8
11
−1.23
38
82
8
22
−0.81
42
88
8
1
−1.55
34
77
8
5
−1.51
35
77
9
16
−1.05
40
84
9
29
−0.65
43
90
9
4
−1.37
36
79
9
7
−1.33
37
80
10
20
−0.86
41
87
10
35
−0.49
45
93
10
9
−1.18
38
82
10
9
−1.15
38
83
11
24
−0.68
43
90
11
40
−0.33
47
95
11
17
−1.00
40
85
11
13
−0.97
40
85
12
30
−0.49
45
93
12
44
−0.16
48
98
12
23
−0.81
42
88
12
19
−0.8
42
88
13
38
−0.31
47
95
13
51
0.00
50
100
13
29
−0.63
44
91
13
25
−0.62
44
91
14
48
−0.12
49
98
14
61
0.16
52
102
14
37
−0.44
46
93
14
33
−0.44
46
93
15
58
0.06
51
101
15
67
0.33
53
105
15
46
−0.26
47
96
15
42
−0.26
47
96
16
66
0.25
52
104
16
72
0.49
55
107
16
54
−0.07
49
99
16
50
−0.09
49
99
17
73
0.43
54
106
17
79
0.65
57
110
17
62
0.11
51
102
17
56
0.09
51
101
18
79
0.62
56
109
18
83
0.81
58
112
18
68
0.30
53
104
18
64
0.27
53
104
19
83
0.8
58
112
19
87
0.98
60
115
19
72
0.48
55
107
19
72
0.45
54
107
20
84
0.99
60
115
20
89
1.14
61
117
20
76
0.67
57
110
20
78
0.62
56
109
21
87
1.17
62
118
21
90
1.30
63
120
21
80
0.85
59
113
21
84
0.80
58
112
22
89
1.35
64
120
22
92
1.46
65
122
22
84
1.04
60
116
22
88
0.98
60
115
23
92
1.54
65
123
23
94
1.63
66
124
23
87
1.22
62
118
23
90
1.16
62
117
24
95
1.72
67
126
24
95
1.79
68
127
24
89
1.41
64
121
24
93
1.33
63
120
25
97
1.91
69
129
25
97
1.95
70
129
25
92
1.59
66
124
25
95
1.51
65
123
26
98
2.09
71
131
26
97
2.11
71
132
26
95
1.78
68
127
26
96
1.69
67
125
27
98
2.28
73
134
27
97
2.28
73
134
27
96
1.96
70
129
27
96
1.87
69
128
28
98
2.46
75
137
28
98
2.44
74
137
28
97
2.15
71
132
28
97
2.04
70
131
29
98
2.65
76
140
29
98
2.60
76
139
29
98
2.33
73
135
29
98
2.22
72
133
30
98
2.83
78
143
30
99
2.76
78
141
30
98
2.52
75
138
30
99
2.40
74
136
31
98
3.02
80
145
31
99
2.93
79
144
31
98
2.71
77
141
31
99
2.58
76
139
32
98
3.20
82
148
32
99
3.09
81
146
32
99
2.89
79
143
32
99
2.75
78
141
33
98
3.39
84
151
33
99
3.25
83
149
33
99
3.08
81
146
33
99
2.93
79
144
34
99
3.57
86
154
34
99
3.42
84
151
34
99
3.26
83
149
34
99
3.11
81
147
> 34
99
> 3.57
> 86
> 154
35
99
3.58
86
154
> 34
99
> 3.26
> 83
> 149
35
99
3.29
83
149
> 34
99
> 3.57
> 86
> 154
36
99
3.74
87
156
> 34
99
> 3.26
> 83
> 149
36
99
3.46
85
152
> 34
99
> 3.57
> 86
> 154
37
99
3.90
89
159
> 34
99
> 3.26
> 83
> 149
37
99
3.64
86
155
> 34
99
> 3.57
> 86
> 154
38
99
4.07
91
161
> 34
99
> 3.26
> 83
> 149
38
99
3.82
88
157
> 34
99
> 3.57
> 86
> 154
> 38
99
> 4.07
> 91
> 161
> 34
99
> 3.26
> 83
> 149
> 38
99
> 3.82
> 88
> 157
N
64
N
109
N
204
N
136
Mean
14.67
Mean
13.00
Mean
16.39
Mean
16.49
SD
5.410
SD
6.149
SD
5.401
SD
5.633
Median
14
Median
13
Median
15
Median
16
Skewness
0.828
Skewness
0.921
Skewness
0.785
Skewness
1.371
Kurtosis
1.488
Kurtosis
1.849
Kurtosis
0.374
Kurtosis
6.377
Range 5-34 Range 2-38 Range 7-34 Range 4-48