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Table 3 Bivariate relationships (Pearson’s r) and multivariate linear regression analysis (standardized beta coefficients) using baseline variables and surgical treatment 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 at two-year follow-up Mental health at two-year follow-up
r β p r β p
Step 1. Socio-demographic and personal variables at baseline
 Work status (reference = working) −0.32* −0.33 0.007 −0.29* −0.16 0.22
 Self-esteem (RSES-4, high scores = low self-esteem) 0.18 0.27 0.05 −0.39** −0.20 0.23
 Self-efficacy (GSE, high scores = high self-efficacy) −0.10 0.01 0.97 0.17 −0.65 0.52
Explained variance (R 2)   19.9% 0.01   18.2% 0.01
Step 2. Subsequent treatment
 Surgery (reference = no surgery) 0.41** 0.29 0.01 0.01 −0.09 0.52
 Change in explained variance   4.9% 0.07   0.8% 0.47
 Explained variance (R2)   24.7%    19.0%  
Step 3. Baseline quality of life (high scores = high quality)
 Baseline physical health 0.39** 0.37 0.002 −0.11 - -
 Baseline mental health −0.13 - - 0.45** 0.33 0.03
 Change in explained variance   12.6% 0.002   7.2% 0.03
 Explained variance (R2)   37.4%    26.3%  
  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