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Chronic Pain: (Von Korff, 1992; n = 2389 [n = 1213 back pain, n = 779 headache, n = 397 temporomandibular disorder {TMD}]; Age Range = 18-75 years)

Chronic Musculoskeletal Pain: (Salaffi et al. 2006; n = 576; Mean Age (SD) = 61.5 (13.5) years; Italian sample; Italian version of CPG)

• Mean (SD) scores on the CPG items:
  • Mean current pain intensity = 4.90 (2.18)
  • Mean average pain intensity in the past 6 months = 5.21 (1.93)
  • Worst pain intensity in the past 6 months = 6.40 (2.14)
  • Mean level of interference of musculoskeletal pain with daily activities = 3.97 (2.56)
  • Mean level of interference of musculoskeletal pain with recreational, social, and family activities = 3.56 (2.70)
  • Mean level of interference of musculoskeletal pain with work/housework = 3.77 (2.76)                                                       

Chronic Pain in Emergency Department: (Bernard, 2004; n = 476, Mean Age = 43.4 (16.3) years; Emergency Department patients reporting chronic pain)

• Grade 0 (null); Grade I (null); Grade II (n = 19, 9.8%); Grade III (n = 62, 32.1%); Grade IV (n = 69, 35.8%)

Chronic Upper Extremity Pain: (Roy, 2012; n = 448, Mean Age = 45 (10) years; Mean symptom duration = 22 (55) months; Work-related upper-extremity injury resulting in disability)

• At baseline (n=557): Grade 0 (null), Grade I (n=28, 5%), Grade II (n=39, 7%), Grade II (n=101, 18%), Grade IV (n=389, 70%)
• At follow-up visit (+6 months, n=448): Grade 0 (n=2, 0.4%), Grade I (n=55, 11%), Grade II (n=40, 8%), Grade III (n=61, 12%), Grade IV (n=340, 68%)

Chronic Low Back Pain: (Dunn, 2003; n = 259; Mean Age = 45 (8.1) years; UK sample)

• Moderate test-retest reliability after 2-weeks (weighted kappa = 0.81 for chronological questionnaire and = 0.60 for traditional questionnaire)

Chronic Back Pain: (Von Korff, 1992)

• Adequate internal consistency (Cronbach¡¯s alpha = 0.74)

Chronic Pain: (Smith, 1997; n = 293; Scottish sample)

• Excellent internal consistency (Cronbach's alpha = 0.91)
• High item-total correlations:
  • Question #1: 0.7085
  • Question #2: 0.6885
  • Question #3: 0.7673
  • Question #4: 0.6951
  • Question #5: 0.8285
  • Question #6: 0.8291
  • Question #7: 0.8061

Chronic Musculoskeletal Pain: (Salaffi, 2006; n = 576; Mean Age (SD) = 61.5 (13.5) years; Italian sample, Italian version of CPGS)

• Good internal consistency (Cronbach¡¯s alpha = 0.89 for Disability Score; = 0.81 for characteristic pain intensity)
• Significant correlation between the pain and disability dimensions of CPG (Spearman¡¯s rho = 0.48)
• Moderate to high item-total correlations
  • Highest item-total correlation for item 7 (r=0.77)
  • Lowest item-total correlation for
  • item 1 (r=0.50)                                                   

Chronic Hip Pain: (Papaioannou, 2018; n = 87; Mean Age = 67 (9.34) years; Greek sample, Greek translation [CPGQ-Gr])

• Excellent internal consistency for total scale, disability scale, and chronic pain intensity (Cronbach¡¯s alpha = 0.90, 0.95, 0.83 respectively) (ICC = 0.84, 0.92, 0.91 respectively)

Chronic Upper Extremity: (Roy, 2012)

• No significant predictive validity for CPG Grades on the probability of work productivity loss, work instability, or outcomes of upper-extremity disability after 6 months.

Chronic Pain: (Smith, 1997)

• ¡°All seven questions included in this analysis had a factor loading greater than 0.75¡­therefore all contributed substantially to the variance explained by this factor. Since the CPG was designed to measure a single concept, i.e., pain, it appeared reasonable that only one factor represented most of the variance between patients.¡±
• Factor analysis values:
  • Question #1: 0.7808
  • Question #2: 0.7677
  • Question #3: 0.8302
  • Question #4: 0.7691
  • Question #5: 0.8866
  • Question #6: 0.8843
  • Question #7: 0.8652
• Adequate convergent validity between the Pain dimension of the SF-36 and the CPGS Pain Intensity Score (Spearman¡¯s correlation coefficient = -0.71); Disability points score ( = -0.71) and Chronic Pain Grade (= -0.84)
• Highly significant correlation between the CPGS and all eight dimensions of the SF-36 (Spearman¡¯s correlation coefficients range from -0.28 to -0.84, p<0.001)

Chronic Pain: (Penny, 1999; n = 6940 [n = 3605 general population, n = 3335 repeat prescription]; UK sample)

• Significant convergent validity between SF-36 and CPGS such that higher CPG correlates with lower mean scores for all eight SF-36 subscales (p<0.001 for eight Kruskal-Wallis Tests)
• Significant convergent validity between Glasgow Pain Questionnaire (GPQ) and CPGS such that higher CPG correlates with higher mean scores for all five GPQ dimensions (p<0.001 for five Kruskal-Wallis Tests)

Chronic Musculoskeletal Pain: (Salaffi, 2006)

Convergent validity

• Significant convergent validity between CPGS and all SF-36 subscales measuring pain and physical health:
  • Characteristic Pain Intensity subscale and SF-36 Bodily Pain subscale (Spearman¡¯s rho = -0.55, p<0.0001)
  • Disability Score subscale and SF-36 Physical Component Summary Scale Score (PCS) dimension (= -0.62, p<0.0001)
• Significant convergent validity between CPGS Grade and presence of comorbid conditions (Chi squared = 36.37)
• Significant convergent validity between CPGS Grade and older age (Chi squared = 64.34)

Discriminant validity

• Significant discriminant validity between CPGS and SF-36 subscales measuring mental health:
  • CPGS Characteristic Pain Intensity, CPGS Disability Score and SF-36 Mental Health subscale (= -0.28, -0.39 respectively)

Chronic Upper Extremity Pain: (Roy, 2012)

• Significant discriminant validity of CPGS on different levels of disability and work status after 6 months as indicated by significantly poorer scores (P<0.008) on the QuickDASH, WLQ-25, and RA-WIS for higher Grades (IV, III) versus lower Grades (I, II)

Chronic Musculoskeletal Pain: (Elliott, 2000; n = 450; Scottish sample)

• Significant correlations between change in CPG and change in multiple SF-36 subscales: Physical functioning (-0.29), Social Functioning (-0.32), Role Physical (-0.34), Bodily Pain (-0.42), General Health (-0.28).
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Chronic Musculoskeletal Pain: (Hawker, 2011)

• Moderate responsiveness after 12 months of treatment in Pain Intensity and Disability subscales (standardized effect size = 0.41, 0.43 respectively)