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 profiles^a

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)