Skip to main content

Table 2 Relative risk (RR) and 95% confidence intervals (CI) for exacerbation of low back pain (LBP) within the occupational groups by severity of disease at recruitment

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

Severity of LBP at recruitment by occupational group Number exacerbated (total number) Incident cases (IR) for 3 years Incident cases (IR) per year RR (95% CI) P
Administrative
 Category 1 1274 (61046) 2.1% 0.7% 1  
 Category 2 123 (4612) 2.7% 0.9% 1.28 (1.07–1.53) < 0.01
 Category 3 79 (1066) 7.4% 2.5% 3.55 (2.85–4.42) < 0.0001
Car drivers
 Category 1 68 (3254) 2.1% 0.7% 1  
 Category 2 10 (333) 3.0% 1.0% 1.48 (0.75–2.76) 0.32
 Category 3 6 (60) 10.0% 3.3% 4.79 (2.16–10.59) < 0.002
Truck drivers
 Category 1 99 (9689) 1.0% 0.3% 1  
 Category 2 13 (473) 2.7% 0.9% 2.69 (1.52–4.76) < 0.002
 Category 3 4 (66) 6.1% 2.0% 5.93 (2.25–15.64) < 0.005
Total drivers
 Category 1 167 (12943) 1.3% 0.4% 1  
 Category 2 23 (806) 2.9% 1.0% 2.21 (1.44–3.40) < 0.001
 Category 3 10 (126) 7.9% 2.6% 6.15 (3.33–11.36) < 0.0001
All subjects
 Category 1 1441 (73989) 1.95% 0.65% 1  
 Category 2 146 (5418) 2.69% 0.90% 1.38 (1.17–1.64) < 0.0001
 Category 3 89 (1192) 7.47% 2.49% 3.83 (3.12–4.71) < 0.0001
  1. Category 1 – No history of LBP
  2. Category 2 – Mild LBP
  3. Category 3 – LBP with mild clinical/radiographic findings
  4. Bold data already signifies a p < 0.05 i.e. significant finding