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Table 2 Condition-based mean values (M) and standard deviation (SD) for SF-12: mental (SF-12m) and physical (SF-12p) scales

From: Randomised controlled comparison of the Health Survey Short Form (SF-12) and the Graded Chronic Pain Scale (GCPS) in telephone interviews versus self-administered questionnaires. Are the results equivalent?

   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