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Table 2 Comparative measures used in studies assessing the construct validity of the BCTQ

From: A systematic review of the psychometric properties of the Boston Carpal Tunnel Questionnaire

Comparative Measures BCTQ construct validity (Spearman rank correlations)
  BCTQ – total score Symptom Severity Score Functional Status Score
Symptoms
Historical-objective severity scale Significant correlation (p < 0.001) (Mondelli et al, 2002)   
Duration of symptoms Significant correlation (p < 0.001) (Mondelli et al, 2002)   
Expectation of symptom relief 0.51 (.56§) (Bessette et al, 1998)   
Symptom relief 0.51 (0.56§) (Bessette et al, 1998) 0.59 (Katz et al, 1996)*
0.31 (Katz et al, 1996)**
0.48 (Katz et al, 1996)*
0.19 BCTQ (Katz et al, 1996)**
Nerve conduction studies
Median-nerve sensory conduction velocity   0.11 (Levine et al, 1993) 0.12 (Levine et al, 1993)
Electrophysiological study Significant correlation (p < 0.001) (Mondelli et al, 2002)   
Clinical sensory tests
Semmes-Weinstein monofilaments   0.17 (Levine et al, 1993) 0.24 (Levine et al, 1993)
2-point discrimination   0.15 (Levine et al, 1993) 0.42 (Levine et al, 1993)
Clinical motor tests
Pinch strength 0.73 (Amadio et al, 1996) 0.47 (Levine et al, 1993) 0.60 (Levine et al, 1993)
Grip strength 0.87 (Amadio et al, 1996) 0.38 (Levine et al, 1993) 0.50 (Levine et al, 1993)
Patient-based measures of function
DASH (6 wk post-operative) 0.90 (Gay et al, 2003)   
DASH (12 wk pos-toperative) 0.87 (Gay et al, 2003)   
Arthritis Impact Measurement Scale 0.71 (Amadio et al, 1996)   
General Health Status, Quality of life and satisfaction
36-item Short-form Health Survey 0.70 (Physical role scale) (Amadio et al, 1996) 0.20 – 0.64 (Preoperative) (Atroshi et al, 1998)
0.33 – 0.64 (Postoperative) (Atroshi et al, 1998)
0.29 – 0.70 (Preoperative) (Atroshi et al, 1998)
0.34 – 0.67 (Postoperative) (Atroshi et al, 1998)
Quality of life 0.50 (0.57§) (Bessette et al, 1998) 0.68 * (Katz et al, 1996)
0.37 ** (Katz et al, 1996)
0.54 * (Katz et al, 1996)
0.41 ** (Katz et al, 1996)
Satisfaction with the outcomes of surgery 0.56 (0.62§) (Bessette et al, 1998) 0.69 * (Katz et al, 1996)
0.37 ** (Katz et al, 1996)
0.55 * (Katz et al, 1996)
0.21 ** (Katz et al, 1996)
  1. Legend:
  2. † – Spearman's rank correlation coefficient and nonparametric test used due to non-normal distribution of the outcome scales.
  3. §-Weighted disease-specific health status measure in BCTQ (For each item subjects were asked how important relief of the specific "symptom" or improvement of the specific "function" was to the decision to have surgery.)
  4. ‡ – Spearman correlation coefficient (minimum and maximum) between the BCTQ overall score and the 8 scales of the 36-item Short-form Health Survey.
  5. * – Workers' compensation recipients
  6. ** – Workers' compensation non-recipients