### Description

The Functional Assessment of Chronic Illness Therapy (FACIT) Fatigue questionnaire can be used to identify patients with chronic disease whose quality of life is affected by fatigue. These patients may benefit from interventions to enhance their functional capacity. The authors are from Northwestern University.

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.