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Table 4 Bivariate relationships (Pearson’s r) and multivariate linear regression analysis (standardized beta coefficients) using change in personal variables to predict SF-12 physical and mental health scores at two-year follow-up (N = 59)

From: Predictors of physical and mental health in persons with morbid obesity attending a patient education course – a two-year follow-up study

Independent variables Physical health two-year follow-up Mental health two-year follow-up
r β p r β p
Step 1. Socio-demographic variables and change in personal variables
 Work status (reference = working) −0.32* −0.19 0.14 −0.29* −0.16 0.18
 Self-esteem change (RSES-4, high scores = decreased self-esteem) −0.23 −0.15 0.36 −0.27* −0.32 0.03
 Self-efficacy change (GSE, high scores = increased self-efficacy) 0.11 −0.05 0.74 0.39** 0.34 0.02
Explained variance (R 2 )   18.9% 0.01   21.0% <0.01
Step 2. Subsequent treatment
 Surgery (reference = no surgery) 0.41** 0.38 <0.01 0.01 −0.20 0.10
 Change in explained variance   5.5% 0.07   2.4% 0.22
 Explained variance (R2)   24.4%    23.4%  
Step 3. Baseline quality of life (high scores = high quality)
 Baseline physical health 0.39** 0.42 0.001 −0.11 - -
 Baseline mental health −0.13 - - 0.45** 0.58 0.001
 Change in explained variance   16.4% 0.001   28.4% <0.001
 Explained variance (R2   40.8%    51.8%  
  1. Note. The displayed results from the multivariate analysis are controlled for all predictors in the model.
  2. *p < 0.05
  3. **p < 0.01