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Table 4 Regression Coefficients1 for General Linear Model for SF36 Physical and Mental Component Summary Scores (n = 1242)

From: Low back pain in 17 year olds has substantial impact and represents an important public health disorder: a cross-sectional study

Physical Component Summary Scores
  β (95% CI)1 p-value
LBP group 2
No LBP REF  
Current Non-chronic LBP
   Males -2.16 (-4.09,-0.23) 0.028
   Females -1.39 (-2.85, 0.07) 0.062
Current chronic LBP
   Males -1.28 (-2.93,0.36) 0.127
   Females -4.60 (-5.88,-3.32) < 0.001
Gender 3
No LBP
   Males REF  
   Females -1.90 (-2.81,-0.99) < 0.001
CNC LBP
   Males REF  
   Females -1.13 (-3.36, 1.10) 0.320
CC LBP
   Males REF  
   Females -5.21(-7.02,-3.40) < 0.001
Other SP areas
No MBP or NSP REF  
MBP or NSP -3.04 (-3.93,-2.16) < 0.001
MBP and NSP -4.56 (-5.76,-3.37) < 0.001
Mental Component Summary Scores
  β (95% CI) p-value
LBP group
No LBP REF  
Current Non-chronic LBP -1.75 (-3.19,-0.31) 0.017
Current chronic LBP -3.45 (-4.73,-2.17) < 0.001
Gender
   Males REF  
   Females -3.53 (-4.47,-2.58) < 0.001
Other SP areas
No MBP or NSP REF  
MBP or NSP -2.83 (-3.93,-1.74) < 0.001
MBP and NSP -4.40 (-5.87,-2.93) < 0.001
  1. 1β coefficients represent the estimated mean difference between the reference group and the contrast group, adjusted for the other variables in the model
  2. 2 Significant gender × LBP group interaction (p = 0.003), therefore effects for LBP group reported separately by each gender, and
  3. 3 Significant gender × LBP group interaction (p = 0.003), therefore effects for female gender reported separately by each category of LBP group.