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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