Baseline variable | Category | Total number (% of experienced OI; % of experienced severe OI) | HR for OI incidence (n = 721)* | HR for OI incidence (n = 721)** | HR for severe OI incidence (≥7 service days lost) (n = 251)* | HR for severe OI incidence (≥7 service days lost) (n = 251)** |
---|---|---|---|---|---|---|
Self-assessed physical fitness1 | Good or very good | 323 (46; 14) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Average or inferior | 1066 (53; 19) | 1.4 (1.1–1.6) | 1.1 (0.9–1.3) | 1.5 (1.1–2.1) | 1.0 (0.7–1.5) | |
Cooper’s test (12-min running test) | Excellent (≥3000 m) | 51 (43; 12) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (≥2600 m) | 330 (44; 13) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) | |
 | Fair good (≥2200 m) | 630 (50; 15) | 1.3 (1.1–1.5) | 1.1 (0.9–1.3) | 1.2 (0.9–1.7) | 1.1 (0.7–1.6) |
 | Poor (<2200 m) | 358 (59; 26) | 1.8 (1.5–2.2) | 1.4 (1.1–1.8) | 2.4 (1.7–3.4) | 1.9 (1.3–3.0) |
Push-up test (repeats per 60 seconds) | Excellent (≥38) | 450 (48; 14) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (≥30) | 312 (52; 19) | 1.2 (1.0–1.5) | 1.1 (0.8–1.3) | 1.3 (0.9–1.9) | 1.1 (0.7–1.6) | |
Fair good (≥22) | 350 (49; 17) | 1.1 (0.9–1.4) | 1.0 (0.8–1.2) | 1.3 (0.9–1.8) | 0.9 (0.6–1.4) | |
 | Poor (<22) | 266 (57; 22) | 1.5 (1.2–1.8) | 1.1 (0.8–1.4) | 1.7 (1.2–2.5) | 1.0 (0.7–1.5) |
Standing long jump test (two attempts, best result) | Excellent (≥2,40 m) | 241 (45; 12) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (≥2,20 m) | 363 (50; 17) | 1.2 (0.9–1.5) | 1.1 (0.9–1.4) | 1.6 (1.0–2.5) | 1.5 (0.9–2.4) | |
Fair good (≥2,00 m) | 442 (52; 17) | 1.2 (0.9–1.6) | 1.1 (0.9–1.4) | 1.5 (1.0–2.3) | 1.4 (0.9–2.2) | |
 | Poor (<2,00 m) | 332 (56; 23) | 1.6 (1.2–2.0) | 1.2 (0.9–1.6) | 2.3 (1.5–3.6) | 1.8 (1.1–3.0) |
Back lift test (repeats per 60 seconds) | Excellent (≥60) | 660 (46; 13) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (≥50) | 284 (50; 22) | 1.1 (0.9–1.4) | 0.9 (0.8–1.2) | 1.7 (1.3–2.4) | 1.4 (1.0–2.0) | |
Fair good (≥40) | 291 (54; 20) | 1.3 (1.1–1.5) | 1.1 (0.9–1.3) | 1.5 (1.1–2.2) | 1.2 (0.8–1.7) | |
 | Poor (<40) | 143 (68; 25) | 1.9 (1.5–2.4) | 1.5 (1.1–1.9) | 2.1 (1.5–3.2) | 1.4 (0.9–2.2) |
Conscript’s muscle fitness index2 | Excellent (13–15 points) | 169 (43; 13) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (9–12 points) | 361 (45; 13) | 1.2 (0.9–1.6) | 1.1 (0.9–1.5) | 1.0 (0.6–1.7) | 0.9 (0.6–1.6) | |
 | Fair good (5–8 points) | 472 (53; 18) | 1.5 (1.1–1.9) | 1.2 (0.9–1.6) | 1.5 (1.0–2.5) | 1.2 (0.7–2.0) |
 | Poor (0–4 points) | 376 (57; 23) | 1.7 (1.3–2.3) | 1.3 (1.0–1.8) | 2.1 (1.3–3.3) | 1.3 (0.8–2.2) |
Conscript’s physical fitness index3 | Excellent (≥21,00) | 69 (39; 9) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (17.00 − 20.99) | 409 (44; 13) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) | |
 | Fair good (13.00 − 16.99) | 590 (53; 17) | 1.3 (1.1–1.5) | 1.2 (1.0–1.5) | 1.2 (0.9–1.7) | 1.2 (0.8–1.7) |
 | Poor (<13.00) | 297 (59; 26) | 1.8 (1.5–2.2) | 1.4 (1.1–1.8) | 2.4 (1.7–3.4) | 1.7 (1.1–2.7) |
Combination of standing long jump and back lift test | Excellent4 | 177 (45; 12) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good5 | 523 (46; 14) | 1.1 (0.8–1.4) | 1.1 (0.9–1.4) | 1.2 (0.7–2.0) | 1.1 (0.7–1.9) | |
Fair good6 | 607 (54; 21) | 1.4 (1.1–1.8) | 1.2 (1.0–1.6) | 1.9 (1.2–3.0) | 1.5 (0.9–2.5) | |
 | Poor7 | 71 (70; 27) | 2.5 (1.7–3.5) | 1.7 (1.2–2.6) | 2.9 (1.6–5.4) | 1.7 (0.8–3.6) |
Combination of back lift and push–up test | Excellen 4 | 335 (44; 13) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good5 | 440 (48; 17) | 1.2 (1.0–1.5) | 1.0 (0.8–1.3) | 1.4 (0.9–2.0) | 1.1 (0.8–1.7) | |
Fair good6 | 536 (55; 20) | 1.5 (1.2–1.8) | 1.1 (0.9–1.4) | 1.7 (1.2–2.4) | 1.1 (0.7–1.7) | |
 | Poor7 | 67 (67; 31) | 2.4 (1.7–3.4) | 1.7 (1.2–2.5) | 3.2 (1.9–5.5) | 1.7 (0.9–3.2) |
Combination of standing long jump and Cooper’s test | Excellent4 | 136 (42; 8) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good5 | 504 (47; 15) | 1.3 (1.0–1.7) | 1.1 (0.8–1.5) | 2.1 (1.1–4.0) | 1.9 (1.0–3.6) | |
Fair good6 | 550 (54; 19) | 1.6 (1.2–2.1) | 1.3 (0.9–1.7) | 2.6 (1.4–4.8) | 2.0 (1.1–3.9) | |
 | Poor7 | 175 (59; 26) | 2.1 (1.5–2.9) | 1.5 (1.0–2.2) | 4.4 (2.2–8.4) | 3.3 (1.6–7.0) |