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Table 1 Relative risk (RR) and 95 % confidence interval (CI) for new-onset or recurrent LBP among young male soldiers (18–21 years), by severity of disease at recruitment for the follow up period and per 1 year

From: The incidence and worsening of newly diagnosed low back pain in a population of young male military recruits

Severity of LBP Military service Incident cases (IRa) for 1 years RR (95 % CI) P
Category 1 - Low Back Pain rates in a healthy population of new recruits AU (5,914) 49 (0.083 %) 1.6 (1.2–2.1) <.001
MU (52,330) 240 (0.046 %) 0.9 (0.9–1.3) NS
CU (101,051) 510 (0.050 %) 1  
Total category 1 159,295 799 (0.050 %)   
Category 2 - LBP rates in a population with minor clinical findings AU (1,350) 26 (1.93 %) 2.6 (1.6–3.6) <.001
MU (12,470) 64 (0.51 %) 0.7 (0.5–0.9) <.001
CU (22,001) 165 (0.75 %) 1 NS
Total category 2 35281 255 (0.71 %)   
Category 3 - LBP rates in a population with positive medical history and no significant radiology findings AU (457) 22 (4.81 %) 2.4 (1.4–3.5) <.001
MU (3,213) 54 (1.68 %) 0.9 (0.6–1.25) NS
CU (3,031) 60 (1.98 %) 1  
Total category 3 6701 136 (2.03 %)   
Category 4 - LBP rates in a population with positive medical history and minimal radiologic findings AU (381) 43 (11.29 %) 2.2 (1.5–2.8) <.001
MU (1,749) 74 (4.23 %) 0.8 (0.6–1.1) NS
CU (1,459) 76 (5.21 %) 1  
Total category 4 3589 193 (5.38 %)   
  1. CU combat units, MU maintenance units, AU administrative units, NS non significant
  2. aCrude incidence rate (%) of new or recurrent cases of LBP during military service