Background
To examine the practical applicability, internal consistency, and validity of the Bt‐DUX, a disease‐specific Health Related Quality of Life (HRQoL) instrument. The Bt‐Dux was developed to examine patients' individual values of their life after a malignant bone tumor of the lower extremity at four domains (cosmetic, social, emotional, and functional).
Procedure
Patients were eligible for this cross‐sectional, multicenter study if they underwent surgery for a malignant tumor of the leg in a period ranging between 12 and 60 months before the recruitment. Assessments included: Bt‐DUX, Toronto Extremity Salvage Score (TESS) Short Form (SF)‐36, TNO‐AZL Questionnaire for Adult's Quality of Life (TAAQOL), and TNO‐AZL Children's Quality of Life Questionnaire (TACQOL).
Results
Seventy‐two patients (35 male, 37 female), mean age 17 (SD 4) years were included. Limb sparing surgery took place in 32 patients and ablative surgery in 40 patients. The Bt‐DUX was completed in less than 5 min and easy to comprehend. The mean Bt‐DUX score was 69.8 (SD 15.5), with Cronbach's alpha being 0.92. Domain–total correlations ranged between 0.84 and 0.88 (P < 0.01). Correlations between Bt‐DUX Total score and TESS, SF‐36 Physical and Mental Component Summary scales and selected TACQOL and TAAQOL scores were statistically significant (P < 0.05), except for the social scale of the TACQOL. The Bt‐DUX was able to discriminate between patients with higher and lower TESS scores (P < 0.05).
Conclusion
The Bt‐DUX was found to be a practical and valid instrument. Its added value compared with existing HRQoL measures needs to be further established. Pediatr Blood Cancer 2009;53:348–355. © 2009 Wiley‐Liss, Inc.