This study investigates the clinical course of and prognostic factors for quality of life (Short Form 36
items Health survey (SF-36)) and global perceived effect (GPE) in patients treated for chronic nonspecific
low back pain at 5 and 12-months follow-up. Data from a prospective cohort (n ¼ 1760) of a
rehabilitation center were used, where patients followed a 2-months cognitive behavior treatment. The
outcome ‘improvement in quality of life (SF-36)’ was defined as a 10% increase in score on the SF-36 at
follow-up compared with baseline. On the GPE scale, patients who indicated to be ‘much improved’ were
coded as ‘clinically improved’. Multivariable logistic regression analysis included 23 baseline characteristics.
At 5-months follow-up, scores on the SF-36 Mental Component Scale (SF-36; MCS) and the
Physical Component Scale (SF-36; PCS) had increased from 46.6 (SD 10.3) to 50.4 (SD 9.8) and from 31.9
(SD 7.1) to 46.6 (SD 10.3), respectively. At 5-months follow-up, 53.0% of the patients reported clinical
improvement (GPE) which increased to 60.3% at 12-months follow-up. The 10% improvement in quality
of life (SF-36 MCS) at 5-months follow-up was associated with patient characteristics and psychological
factors. At 5-months follow-up, the 10% improvement in quality of life (SF-36 PCS) and GPE was associated
with patient characteristics, physical examination, work-related factors and psychological factors;
for GPE, an association was also found with clinical status. At 12-months follow-up GPE was associated
with patient characteristics, clinical status, physical examination and work-related factors. The next
phase in this prognostic research is external validation of these results
This study investigates the clinical course of and prognostic factors for quality of life (Short Form 36items Health survey (SF-36)) and global perceived effect (GPE) in patients treated for chronic nonspecificlow back pain at 5 and 12-months follow-up. Data from a prospective cohort (n ¼ 1760) of arehabilitation center were used, where patients followed a 2-months cognitive behavior treatment. Theoutcome ‘improvement in quality of life (SF-36)’ was defined as a 10% increase in score on the SF-36 atfollow-up compared with baseline. On the GPE scale, patients who indicated to be ‘much improved’ werecoded as ‘clinically improved’. Multivariable logistic regression analysis included 23 baseline characteristics.At 5-months follow-up, scores on the SF-36 Mental Component Scale (SF-36; MCS) and thePhysical Component Scale (SF-36; PCS) had increased from 46.6 (SD 10.3) to 50.4 (SD 9.8) and from 31.9(SD 7.1) to 46.6 (SD 10.3), respectively. At 5-months follow-up, 53.0% of the patients reported clinicalimprovement (GPE) which increased to 60.3% at 12-months follow-up. The 10% improvement in qualityof life (SF-36 MCS) at 5-months follow-up was associated with patient characteristics and psychologicalfactors. At 5-months follow-up, the 10% improvement in quality of life (SF-36 PCS) and GPE was associatedwith patient characteristics, physical examination, work-related factors and psychological factors;for GPE, an association was also found with clinical status. At 12-months follow-up GPE was associatedwith patient characteristics, clinical status, physical examination and work-related factors. The nextphase in this prognostic research is external validation of these results
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