The instrument consists of 13 statements.
Response best describing status during the past 7 days (last week).
Direction of responses:
(1) Increasing fatigue: 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 13
(2) Decreasing fatigue: 7 and 8
|
Response
|
Increasing Fatigue
|
Decreasing Fatigue
|
|
not at all
|
0
|
4
|
|
a little bit
|
1
|
3
|
|
somewhat
|
2
|
2
|
|
quite a bit
|
3
|
1
|
|
very much
|
4
|
0
|
FACIT fatigue score =
= SUM(points for all 13 questions)
Interpretation:
• minimum score: 0
• maximum score: 52
• The higher the score, the greater the level of fatigue.
• The score can be adjusted to a 0-100 linear score by using a log-linear transformation, as shown in Figure 2 and listed in Table 2 on page 532.
Equations derived in JMP to describe the curves are:
Over range of raw scores 0 to 12
linear score =
= (-0.00545 * ((raw score)^4)) + (0.1745 * ((raw score)^3)) - (2.0614 * ((raw score)^2)) + (12.3076 * (raw score)) + 0.2343
Over range of raw scores 12 to 41
linear score =
= (0.8665 * (raw score)) + 30.137
Over range of raw scores of 41 to 52 (I would check this before using):
linear score =
= (0.007685 * ((raw score)^4)) - (1.3799 * ((raw score)^3)) + (92.89339 * ((raw score)^2)) - (2776.926 * (raw score)) + 31157.556
Performance:
• A raw score 0f 43 (corresponding to an interval measure of 68) was 92% sensitive and 69% specific for dividing anemic cancer patients from the general population, with an 84% overall accuracy.
