Baseline variable | Category | Total number (% of experienced AI; % of experienced severe AI) | HR for AI incidence (n = 386)* | HR for AI incidence (n = 386)** | HR for severe AI incidence (≥7 service days lost) (n = 89)* | HR for severe AI incidence (≥7 service days lost) (n = 89)** |
---|---|---|---|---|---|---|
Self-assessed physical fitness1 | Good or very good | 323 (29; 6) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Average or inferior | 1066 (27; 6) | 1.0 (0.8–1.3) | 0.9 (0.7–1.1) | 1.2 (0.7–2.0) | 0.8 (0.5–1.5) | |
Cooper’s test (12-min running test) | Excellent (≥3000 m) | 51 (22; 0) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (≥2600 m) | 330 (26; 5) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) | |
 | Fair good (≥2200 m) | 630 (28; 7) | 1.2 (0.9–1.5) | 1.1 (0.8–1.4) | 1.6 (0.9–2.9) | 1.3 (0.7–2.3) |
 | Poor (<2200 m) | 358 (28; 7) | 1.3 (1.0–1.7) | 1.2 (0.9–1.7) | 1.9 (1.0–3.5) | 1.3 (0.6–2.7) |
Push-up test (repeats per 60 seconds) | Excellent (≥38) | 450 (26; 5) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (≥30) | 312 (25; 4) | 0.9 (0.7–1.3) | 0.9 (0.7–1.2) | 0.9 (0.4–1.7) | 0.7 (0.4–1.5) | |
Fair good (≥22) | 350 (28; 7) | 1.1 (0.8–1.5) | 1.0 (0.7–1.3) | 1.4 (0.8–2.5) | 0.9 (0.5–1.7) | |
 | Poor (<22) | 266 (32; 10) | 1.4 (1.1–1.9) | 1.2 (0.9–1.6) | 2.2 (1.3–3.9) | 1.7 (0.9–3.1) |
Standing long jump test (two attempts, best result) | Excellent (≥2,40 m) | 241 (22; 3) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (≥2,20 m) | 363 (28; 6) | 1.3 (0.9–1.8) | 1.2 (0.8–1.6) | 1.8 (0.8–4.1) | 1.6 (0.7–3.7) | |
Fair good (≥2,00 m) | 442 (30; 6) | 1.4 (1.0–1.9) | 1.2 (0.9–1.7) | 1.9 (0.9–4.2) | 1.7 (0.7–3.8) | |
 | Poor (<2,00 m) | 332 (28; 9) | 1.4 (1.0–2.0) | 1.2 (0.9–1.8) | 3.3 (1.5–7.1) | 2.8 (1.2–6.4) |
Conscript’s muscle fitness index 2 | Excellent (13–15 points) | 169 (21; 4) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (9–12 points) | 361 (30; 6) | 1.5 (1.0–2.2) | 1.4 (1.0–2.1) | 1.7 (0.7–4.3) | 1.6 (0.6–4.0) | |
 | Fair good (5–8 points) | 472 (27; 6) | 1.4 (0.9–2.0) | 1.2 (0.8–1.8) | 1.9 (0.8–4.6) | 1.4 (0.6–3.6) |
 | Poor (0–4 points) | 376 (29; 8) | 1.6 (1.1–2.4) | 1.3 (0.9–2.0) | 2.6 (1.1–6.3) | 1.8 (0.7–4.6) |
Conscript’s physical fitness index3 | Excellent (≥21,00) | 69 (16; 0) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good (17.00 − 20.99) | 409 (29; 6) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) | |
 | Fair good (13.00 − 16.99) | 590 (27; 7) | 1.0 (0.8–1.3) | 0.9 (0.7–1.1) | 1.5 (0.9–2.4) | 1.1 (0.6–1.9) |
 | Poor (<13.00) | 297 (29; 8) | 1.2 (0.9–1.6) | 1.0 (0.7–1.4) | 1.9 (1.1–3.4) | 1.3 (0.6–2.6) |
Combination of standing long jump and push–up test | Excellent4 | 144 (18; 2) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good5 | 447 (30; 6) | 1.7 (1.1–2.6) | 1.4 (0.9–2.2) | 3.0 (0.9–9.8) | 2.5 (0.8–8.4) | |
Fair good6 | 650 (27; 6) | 1.6 (1.1–2.4) | 1.3 (0.8–2.0) | 3.0 (0.9–9.6) | 2.1 (0.6–6.9) | |
 | Poor7 | 137 (33; 14) | 2.5 (1.5–4.0) | 1.8 (1.0–3.0) | 8.8 (2.6–29.8) | 5.9 (1.6–21.3) |
Combination of standing long jump and Cooper’s test | Excellent4 | 136 (21; 2) | 1 (Referent) | 1 (Referent) | 1 (Referent) | 1 (Referent) |
Good 5 | 504 (28; 6) | 1.4 (0.9–2.1) | 1.4 (0.9–2.0) | 3.0 (0.9–9.8) | 2.7 (0.8–9.0) | |
Fair good6 | 550 (27; 6) | 1.4 (0.9–2.1) | 1.2 (0.8–1.9) | 2.8 (0.9–9.2) | 2.4 (0.7–8.1) | |
 | Poor7 | 175 (31; 12) | 1.9 (1.2–2.9) | 1.7 (1.0–2.8) | 7.0 (2.1–23.6) | 5.8 (1.6–21.3) |