Journal of Patient-Reported Outcomes

Table 2 IRT to Raw Sum Score Look-up Table

From: Expected a posteriori scoring in PROMIS^®

Raw Sum score	IRT Theta score
3	− 3.59
4	− 3.36
5	− 3.15
6	− 2.96
7	− 2.78
8	− 2.60
9	− 2.42
10	− 2.23
11	− 2.03
12	− 1.81
13	− 1.54
14	− 1.18
15	0.21

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