Research Article
Validation of the Danish Version of Functional Assessment of Multiple Sclerosis: A Quality of Life Instrument
Table 2
FAMS subscale scores and total score: data quality, scaling assumption, acceptability, and reliability (
).
| | Psychometric property | Mobility
(7 items) | Symptoms
(7 items) | Emotional well-being
(7 items) | General contentment
(7 items) | Thinking/
fatique
(9 items) | Family/social well-being
(7 items) | FAMS total
(44 items) |
| | Data quality | | | | | | | | | (i) Responses with missing items (%) | 11.0 | 5.8 | 7.4 | 7.4 | 6.3 | 5.3 | 26.8 |
| | Scale assumptions | | | | | | | | | (i) Subscore mean (range) | 12.6 (1–27) | 20.9 (6–28) | 19.4 (1–28) | 17.8 (0–28) | 19.6 (0–35) | 20.7 (5–28) | 110.7 (34–167) | | (ii) Item mean score | 1.3–2.2 | 2.5–3.8 | 2.0–3.3 | 2.0–2.8 | 1.8–2.5 | 2.6–3.3 | 1.4–3.8 | | (iii) Item sd score | 0.9–1.2 | 0.6–1.3 | 1.0–1.3 | 1.1–1.3 | 1.2–1.3 | 1.0–1.2 | 0.6–1.3 | | (iv) Item-scale correlation | 0.53–0.77 | 0.36–0.79 | 0.65–0.84 | 0.63–0.83 | 0.66–0.81 | 0.68–0.80 | 0.10–0.77 |
| | Acceptability | | | | | | | | | (i) Possible score range | 0–28 | 0–28 | 0–28 | 0–28 | 0–36 | 0–28 | 0–168 | | (ii) Observed score range | 1–27 | 6–28 | 1–28 | 0–28 | 0–35 | 5–28 | 34–167 | | (iii) Mean score (SD) | 12.6 (5.2) | 20.9 (5.2) | 19.4 (6.4) | 17.8 (5.9) | 19.6 (8.5) | 20.7 (5.6) | 110.7 (28.0) | | (iv) Median (IQR) | 12 (9–16) | 22 (18–25) | 21 (15–24) | 18 (13–22) | 20 (13–27) | 22 (17–25) | 114 (91–131) | | (v) Floor/ceiling effects (%) | 0/0 | 0/7 | 0/6 | 1/2 | 1/0 | 0/8 | 0/0 | | (vi) Skewness | 0.35 | −0.73 | −0.81 | −0.35 | −0.75 | −0.75 | −0.39 |
| | Reliability | | | | | | | | | (i) Cronbach’s alpha | 0.79 | 0.79 | 0.90 | 0.62 | 0.91 | 0.85 | 0.94 |
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