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Table 1 Relative risk (RR) and 95% confidence intervals (CI) for newly diagnosed and exacerbated low back pain (LBP) among soldiers (18–21 years), by severity of disease and occupational category

From: The relationship between low back pain and professional driving in young military recruits

Severity of LBP at recruitment Occupational Categories Incident cases (IR*) for 3 years Incident cases (IR*) per year RR (95% CI) P
Category 1 (No history of LBP) Administrative (n = 61,046) 2.09% 0.7% 1  
Car drivers (n = 3254) 2.09% 0.7% 1.0 (0.79–1.28) 0.957
Truck drivers (n = 9689) 1.02% 0.34% 0.49 (0.40–0.60) < 0.0001
Total n = 73,989 1.95% 0.65%
Category 2 (Mild LBP) Administrative (n = 4612) 2.67% 0.89% 1  
Car drivers (n = 333) 3.00% 1.00% 1.13 (0.60–2.12) 0.724
Truck drivers (n = 743) 2.75% 0.92% 1.03 (0.5–1.81) 0.881
Total n = 5418 2.69% 0.90%
Category 3 (LBP with mild clinical/radiographic findings) Administrative (n = 1066) 7.41% 2.47% 1  
Car drivers (n = 60) 10.00% 3.33% 1.35 (0.61–2.97) 0.448
Truck drivers (n = 66) 6.06% 2.02% 0.82 (0.31–2.16) 1.000
Total n = 1192 7.47% 2.49%
  1. Bold data already signifies a p < 0.05 i.e. significant finding