Table 2.
FAMS subscale scores and total score: data quality, scaling assumption, acceptability, and reliability (n = 190).
| 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 |