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Table 2 Relative risks (RR) with 95% confidence intervals (95% CI) for neck and upper extremity symptoms in relation to perceived exertion, working technique score and comfort

From: Perceived exertion, comfort and working technique in professional computer users and associations with the incidence of neck and upper extremity symptoms

  Neck   Shoulder   Arm/hand  
  Cases/Non cases RR (95% CI) Cases/Non cases RR (95% CI) Cases/Non cases RR (95% CI)
Perceived Exertion       
Neck 298/553      
   Low (0-4) 128/351 1     
   Medium (5-7) 111/166 1.70 (1.32-2.20)     
   High (8-14) 59/36 3.20 (2.31-4.38)     
Shoulder    163/689    
   Low (0-4)    88/521 1   
   Medium (5-7)    50/147 1.96 (1.38 -2.77)   
   High (8-14)    25/21 5.49 (3.41 -8.51)   
Arm/hand      220/631  
   Low (0-4)      154/528 1
   Medium (5-7)      56/97 1.86 (1.36-2.51)
   High (8-14)      10/6 4.41 (2.16 -8.03)
Working Technique 245/435   130/550   176/504  
   Good (> 14) 162/303 1 92/373 1 121/344 1
   Acceptable (13-14) 55/88 1.06 (0.77-1.43) 27/116 0.89 (0.57-1.35) 37/106 0.91 (0.62-1.31)
   Poor (< 13) 28/44 1.03 (0.67-1.51) 11/61 0.73 (0.37-1.30) 18/54 0.90 (0.53-1.44)
Comfort 298/551   163/686   222/627  
   Good (≥3) 55/132 1 31/156 1 44/143 1
   Medium (1-3) 190/345 1.41 (1.05-1.92) 105/430 1.37 (0.92-2.09) 140/395 1.21 (0.86-1.72)
   Poor (-4-0) 53/74 1.88 (1.28-2.76) 27/100 1.62 (0.95-2.73) 38/89 1.53 (0.98-2.38)
  1. Adjusted for age, sex and duration of daily computer work. Bold figures represent statistically significant results
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