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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: J Anxiety Disord. 2013 Dec 1;28(1):88–96. doi: 10.1016/j.janxdis.2013.11.006

Table A.2.

Raw Score to T-Score Conversion Table (IRT Fixed-Parameter Calibration Linking) for GAD-7 to PROMIS Anxiety

GAD-7 Score PROMIS T-score T-Score SE
0 38.5 6.1
1 44.5 4.6
2 47.9 4.0
3 50.4 3.7
4 52.6 3.5
5 54.6 3.4
6 56.3 3.3
7 57.9 3.3
8 59.4 3.3
9 60.9 3.2
10 62.3 3.2
11 63.7 3.2
12 65.0 3.1
13 66.4 3.1
14 67.7 3.1
15 69.0 3.1
16 70.4 3.2
17 71.9 3.3
18 73.5 3.4
19 75.3 3.6
20 77.2 3.7
21 80.1 4.1