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Table 5 Prevalence and association of occupation with chronic low back pain

From: Increase of chronic low back pain prevalence in a medium-sized city of southern Brazil

Variable         Crude analyses   Adjusted analyses**
N % PRR 95% CI P PRR 95% CI P
Occupation      0,001*    0,03*
Never Worked 195 4.6 1 -   1 -  
Trade/sales 480 6.3 1.35 0.65-2.82   1.36 0.62-3.00  
Health 124 8.9 1.91 0.82-4.47   1.53 0.62-3.75  
Education 205 8.3 1.79 0.77-4.14   1.66 0.71-3.89  
Manufacturing 350 10.0 2.16 1.00-4.64   2.07 0.94-4.54  
Cleaning 346 14.4 3.11 1.49-6.49   2.11 1.00-4.54  
Services 864 10.3 2.23 1.15-4.33   2.30 1.13-4.65  
Civil construction 99 9.1 1.96 0.79-4.88   2.47 0.92-6.64  
Agriculture 66 16.7 3.59 1.43-9.01   2.78 1.03-7.51  
  1. * Wald Test for Heterogeneity.
  2. **Adjusted for the variables from 1st, 2nd and 3rd levels.
  3. 95% Confidence Interval.