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Table 4 Health related quality of life (SF-36), the relative risk and the risk difference

From: The long-term effects of naprapathic manual therapy on back and neck pain - Results from a pragmatic randomized controlled trial

Good quality of life Index Group Control Group RR RD p-value
(Subscales of SF-36) proportion (good/not good)* proportion (good/not good)* (95% CI) (95% CI)  
Base line      
Bodily Pain 2% 3% - - -
  (n = 4/202) (n = 6/197)    
Physical Function 17% 22% - - -
  (n = 34/166) (n = 45/156)    
Social Function 35% 33% - - -
  (n = 72/132) (n = 66/137)    
Role Emotion 55% 57% - - -
  (n = 114/92) (n = 116/87)    
General Health 34% 35% - - -
  (n = 69/133) (n = 70/129)    
26 weeks      
Bodily Pain 37% 24% 1.2 13%  
  (n = 69/120) (n = 43/133) (1.0-1.4) (3-21) 0.012
Physical Function 41% 35% 1.1 6%  
  (n = 75/110) (n = 61/113) (0.9-1.3) ((-5)-16) 0.285
Social Function 51% 37% 1.3 14%  
  (n = 95/91) (n = 65/110) (1.1-1.5) (4-24) 0.008
Role Emotion 57% 48% 1.2 9%  
  (n = 106/79) (n = 83/91) (1.0-1.5) ((-1)-20) 0.069
General Health 38% 36% 1.0 2%  
  (n = 70/116) (n = 63/112) (0.9-1.2) ((-8)-12) 0.748
52 weeks      
Bodily Pain 39% 28% 1.2 11%  
  (n = 71/113) (n = 45/114) (1.0-1.4) (0-20) 0.045
Physical Function 42% 32% 1.2 10%  
  (n = 76/105) (n = 50/107) (1.0-1.4) (0-20) 0.055
Social Function 49% 36% 1.2 13%  
  (n = 89/92) (n = 58/101) (1.0-1.5) (2-23) 0.018
Role Emotion 55% 46% 1.2 9%  
  (n = 101/84) (n = 72/85) (1.0-1.5) ((-2)-19) 0.107
General Health 39% 34% 1.1 5%  
  (n = 70/110) (n = 54/106) (0.9-1.3) ((-5)-15) 0.326
  1. The proportion of patients with good health related quality of life (subscales of SF-36) in the intervention groups at baseline and at follow-ups, the relative risk (RR), and the risk difference (RD), with corresponding 95% confidence intervals (95% CI) and p-values at follow-ups.
  2. * Numbers of persons with good/not good subscales of health related quality of life (SF-36) in the intervention groups.