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Table 1 Contributions of the variables to baseline SF-36 Mental Health scores

From: A clinical genetic method to identify mechanisms by which pain causes depression and anxiety

    Correlation (r) with   
Quantitative variables Mean STD Baseline SF36-MH R2 p-value
Baseline bodily pain 3.67 1.12 -0.36   0.130 <0.0001
Age 41.8 10.6 0.15   0.023 0.0121
    Baseline SF36-MH   
Categorical variables Category n Mean STD   
Sex Male 166 61.25 19.88 0.002 0.5065
  Female 110 62.95 19.35   
Workers' compensation Yes 105 56.15 20.53 0.052 0.0001
  No 171 65.47 18.27   
Length of episode <=6 week 54 68.52 18.99 0.033 0.0109
  6–26 weeks 133 61.29 17.95   
  >26 weeks 89 58.88 21.68 0.006 0.2024
Comorbid illnesses Yes 69 59.36 19.81   
  No 207 62.78 19.58   
  R2 from the model including all above variables 0.227  
  1. Note: R2 was calculated using the model including only one variable.
  2. SF-36 MH scores range from 0–100, where 100 means "always happy and calm over past month."
  3. 280 (surgical+ non-surgical) patients have DNA, four patients, 3 missing baseline SF36-MH and 1 missing baseline bodily pain, were dropped from analysis
  4. In covariate selection, linear regression with backward selection method (p = 0.1) was applied, where baseline Sf36-MH was dependent variables, age, sex, workers' compensation, baseline bodily pain, comorbid illnesses, patient group (nonsurgical vs. surgical), marital status, education, and prior episodes were independent variables, and age, sex and workers' compensation were fixed in the model