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Table 2 Contributions of the variables to 1-year 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 1 year SF36-MH R2 p-value
Mean bodily pain at 3 and 6 month 2.03 1.11 -0.450   0.203 <0.0001
Baseline SF36-MH 61.62 18.15 0.436   0.190 <0.0001
Baseline bodily pain 3.9 0.99 0.118   0.014 0.1642
Age 42.84 10.07 0.042   0.002 0.623
    1 year SF36-MH   
Categorical variables Category n Mean STD   
Sex Male 86 74.88 20.34 0.001 0.724
  Female 55 73.60 21.92   
Workers' compensation Yes 42 68.00 25.05 0.040 0.018
  No 99 77.09 18.44   
Crossover 0 month 120 76.83 18.54 0.079 0.001
  3 or 6 month 21 60.38 28.03   
  R2 from the model including all above variables 0.435  
  1. Note: R2 was calculated using the model including only one variable.
  2. In covariate selection, linear regression with backward selection method (p = 0.1) was applied, where 1 year SF-36 MH was the dependent variable; age, sex, workers' compensation, baseline bodily pain, prior episodes, and the SF-36 General Health, Vitality, Social Function, and Emotional Role subscales were independent variables; and age, sex and workers' compensation were fixed in the model.
  3. 141 of 162 surgical patients with both 1 year mood data and all 7 covariates and DNA were used in the 1 year mood analysis.
  4. "Crossover" refers to the time point when a questionnaire showed that a patient who initially chose nonsurgical treatment underwent lumbar discectomy.