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Table 2 The RR and Confidence Interval of developing or worsening new-onset or recurrence of LBP within the same types of military duty in varying medical profilesa

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

Category Combat unit Maintenance unit Administrative unit Total
2/1 1.4 (1.2–1.6) 1.1 (0.8–1.4) 2.3 (1.4–3.3) 1.4 (1.2–1.6)
3/1 4.1 (3.8–4.7) 3.7 (2.7–4.6) 5.8 (3.4–8.2) 4.1 (3.4–4.7)
4/1 10.7 (9.3–12.2) 9.2 (7.2–11.3) 13.6 (9.8–17.5) 10.7 (9.3–12.2)
3/2 2.6 (2.0–3.3) 3.3 (2.4–4.2) 2.5 (1.4–3.6) 2.9 (2.4–3.5)
4/2 7.0 (5.4–8.5) 8.3 (6.4–10.1) 5.9 (4.2–7.6) 7.6 (6.5–8.6)
4/3 2.6 (2.0–3.3) 2.5 (1.9–3.1) 2.3 (2.0–3.1) 2.7 (2.3–3.1)
  1. 1- All subjects that have no evidence of past and/or present LBP
  2. 2 - Mild scoliosis or kyphosis; negative medical history for LBP
  3. 3- Positive medical history for LBP; no clinical findings; normal X-rays
  4. 4- Positive medical history for LBP; no clinical findings; X-ray with mild changes
  5. aThe RR is calculated by dividing incidence rates. For example the rate between category 1 to category 0 (1/0) is calculated by dividing the incidence in category 1 (0.99 %) to the incidence in category 0 (0.041 %); the result is 24.8