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Table 3 Condition-based mean values (M) and standard deviation (SD) for GCPS: pain intensity (PI) and pain-related disability (PD) 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 PI M (SD) PD M (SD) PI M (SD) PD M (SD) N
Delayed Self-administered questionnaire first 55.56 (19.3) 31.20 (25.7) 55.56 (19.8) 34.53 (26.7) 205
  Telephone interview first 52.32 (19.9) 26.75 (25.4) 52.68 (19.7) 30.96 (24.7) 194
  Total 53.99 (19.7) 29.03 (25.7) 54.16 (19.8) 32.79 (25.7) 399
At outset Self-administered questionnaire first 56.39 (17.8) 31.06 (24.9) 55.34 (20.4) 34.55 (25.7) 203
  Telephone interview first 56.00 (20.9) 30.75 (26.2) 55.68 (20.2) 32.37 (24.3) 190
  Total 56.20 (19.3) 30.91 (25.5) 55.50 (20.3) 33.51 (25.0) 393
Total Self-administered questionnaire first 55.97 (18.6) 31.13 (25.3) 55.45 (20.1) 34.54 (26.2) 408
  Telephone interview first 54.14 (20.5) 28.71 (25.8) 54.17 (20.0) 31.65 (24.5) 384
  Total 55.08 (19.5) 29.96 (25.6) 54.83 (20.0) 33.15 (25.4) 792