Table 1 SF-12 item and summary descriptive statistics (N = 1005)
From: Validity of SF-12 summary scores in a Greek general population
Item description (scale) | Mean (SD) | 95% CI | Median | Response frequencies (%) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Â | Â | Â | Â | 1 | 2 | 3 | 4 | 5 | 6 |
Moderate activities (PF) | 2.64 (0.66) | 2.60-2.68 | 3.00 | 10.1 | 15.7 | 74.2 | - | - | - |
Climb several flights (PF) | 2.54 (0.72) | 2.50–2.59 | 3.00 | 13.5 | 18.5 | 68.0 | - | - | - |
Accomplished less (RP) | 1.80 (0.40) | 1.77–1.82 | 2.00 | 20.4 | 79.6 | - | - | - | - |
Limited kind of work (RP) | 1.82 (0.39) | 1.79–1.84 | 2.00 | 18.4 | 81.6 | - | - | - | - |
Pain interferes1 (BP) | 4.36 (1.08) | 4.29–4.42 | 5.00 | 3.0 | 7.3 | 7.2 | 16.2 | 66.3 | - |
Health in general1 (GH) | 3.24 (1.10) | 3.17–3.30 | 3.00 | 5.9 | 19.9 | 33.2 | 26.8 | 14.2 |  |
Energy1 (VT) | 4.19 (1.31) | 4.11–4.28 | 4.00 | 2.9 | 9.7 | 15.6 | 24.9 | 30.9 | 16.0 |
Social time (SF) | 4.16 (1.15) | 4.09–4.23 | 5.00 | 3.8 | 7.7 | 13.3 | 19.5 | 55.7 | - |
Accomplished less (RE) | 1.80 (0.40) | 1.77–1.82 | 2.00 | 20.2 | 79.8 | - | - | - | - |
Note careful (RE) | 1.84 (0.37) | 1.82–1.86 | 2.00 | 16.0 | 84.0 | - | - | - | - |
Peaceful1 (MH) | 3.92 (1.21) | 3.84–3.99 | 4.00 | 2.3 | 11.8 | 20.6 | 30.4 | 26.9 | 8.0 |
Blue/sad (MH) | 4.58 (1.22) | 4.50–4.66 | 5.00 | 1.6 | 5.9 | 9.7 | 23.5 | 34.1 | 25.2 |
Summary statistics | PCS-12 | MCS-12 | Â | Â | Â | Â | Â | Â | Â |
Mean (SD) | 49.42 (10.56) | 48.91 (9.20) | Â | Â | Â | Â | Â | Â | Â |
95% CI | 48.77–50.08 | 48.34–49.48 |  |  |  |  |  |  |  |
Median | 54.21 | 51.35 | Â | Â | Â | Â | Â | Â | Â |
Skewness | -1.34 | -1.09 | Â | Â | Â | Â | Â | Â | Â |
Minimum (% floor) | 14.01 (0.01) | 13.89 (0.01) | Â | Â | Â | Â | Â | Â | Â |
Maximum (% ceiling) | 66.76 (0.01) | 65.39 (0.01) | Â | Â | Â | Â | Â | Â | Â |