Table 2.
Characteristics of SF-36 scales and summary measures at baseline (N = 73)
| SF-36 scale | Normed scores | Raw scores | |||
|---|---|---|---|---|---|
| Mean (SD) | Median (IQR) | Possible range | Observed range | Floor/ceiling effects | |
| Physical functioning | 44.0 (6.4) | 42.5 (39.4–47.2) | 10–30 | 10–26 | No |
| Role physical | 44.6 (6.0) | 45.3 (39.8–48.9) | 4–20 | 4–17 | Floor effect (19 % scored 4) |
| Bodily pain | 53.6 (9.7) | 52.4 (45.3–65.3) | 2–12 | 3.2–12 | Ceiling effect (30 % scored 12) |
| General health | 41.2 (8.1) | 41.4 (34.9–46.2) | 5–25 | 5–21.4 | No |
| Vitality | 41.5 (8.7) | 39.9 (34.3–48.2) | 4–20 | 4–15 | No |
| Social functioning | 46.2 (8.7) | 45.1 (41.3–52.7) | 2–10 | 2–10 | No |
| Role emotional | 49.8 (8.9) | 55.0 (42.8–57.4) | 3–15 | 3–15 | Ceiling effect (49 % scored 15) |
| Mental health | 48.7 (9.8) | 50.6 (44.0–56.0) | 5–25 | 9–25 | No |
| PCS | 44.6 (5.8) | 44.1 (40.9–47.8) | N/A | N/A | No |
| MCS | 48.1 (8.8) | 49.8 (42.4–54.9) | N/A | N/A | No |
SD standard deviation, IQR inter-quartile range, PCS physical component summary (of SF-36), MCS mental component summary (of SF-36), N/A not applicable