Table 2 Condition-based mean values (M) and standard deviation (SD) for SF-12: mental (SF-12m) and physical (SF-12p) scales
| Â | Â | Telephone interview | Self-administered questionnaire | Â | ||
|---|---|---|---|---|---|---|
Timing of information about second survey | Survey-mode sequence | SF-12p M (SD) | SF-12m M (SD) | SF-12p M (SD) | SF-12m M (SD) | N |
Delayed | Self-administered questionnaire first | 45.22 (10.0) | 49.10 (10.6) | 43.21 (10.0) | 44.69 (11.3) | 183 |
| Â | Telephone interview first | 44.83 (11.0) | 49.79 (9.8) | 42.67 (10.6) | 46.93 (10.5) | 178 |
| Â | Total | 45.03 (10.5) | 49.44 (10.2) | 42.94 (10.3) | 45.79 (11.0) | 361 |
At outset | Self-administered questionnaire first | 43.91 (10.1) | 48.19 (11.0) | 42.32 (9.6) | 44.35 (11.3) | 183 |
| Â | Telephone interview first | 43.68 (10.2) | 49.80 (10.1) | 42.35 (9.8) | 47.01 (10.5) | 164 |
| Â | Total | 43.80 (10.2) | 48.95 (10.6) | 42.33 (9.7) | 45.61 (11.0) | 347 |
Total | Self-administered questionnaire first | 44.57 (10.1) | 48.65 (10.8) | 42.77 (9.8) | 44.52 (11.3) | 366 |
| Â | Telephone interview first | 44.28 (10.6) | 49.80 (9.9) | 42.51 (10.2) | 46.97 (10.5) | 342 |
| Â | Total | 44.43 (10.3) | 49.20 (10.4) | 42.64 (10.0) | 45.70 (11.0) | 708 |