‘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
‘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
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