Table 3. Raw SF-36 Vitality Scale Score to T Score Conversion Table (IRT Fixed Parameter Calibration Linking).

Vitality Expected Total Raw Score	PROMIS T score	T score SE
4	29.0	4.9
5	34.2	4.0
6	38.2	3.8
7	41.6	3.6
8	44.8	3.5
9	47.5	3.4
10	49.9	3.4
11	52.1	3.3
12	54.1	3.3
13	56.0	3.3
14	57.9	3.3
15	59.8	3.3
16	61.8	3.3
17	64.0	3.3
18	66.3	3.4
19	69.3	3.6
20	73.9	4.5

NOTE: T score SE is the standard error of the estimated PROMIS T score in the adjacent column.