|
Condition-based mean values (M) and standard deviation (SD) for SF-12: mental (SF-12m) and physical (SF-12p) scales |
||||||
| Telephone interview |
Self-administered questionnaire |
|||||
|
|
||||||
| 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 |
| Telephone interview first |
44.83 (11.0) |
49.79 (9.8) |
42.67 (10.6) |
46.93 (10.5) |
178 |
|
| 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 |
| Telephone interview first |
43.68 (10.2) |
49.80 (10.1) |
42.35 (9.8) |
47.01 (10.5) |
164 |
|
| 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 |
| Telephone interview first |
44.28 (10.6) |
49.80 (9.9) |
42.51 (10.2) |
46.97 (10.5) |
342 |
|
| Total |
44.43 (10.3) |
49.20 (10.4) |
42.64 (10.0) |
45.70 (11.0) |
708 |
|
Lungenhausen et al. BMC Medical Research Methodology 2007 7:50 doi:10.1186/1471-2288-7-50 |
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