Military service discharges in relation to musculoskeletal and skin conditions, stratified by sex, in the US Army study population, 2014–2017 (N=657 417). Values represent numbers (percentages).
| Factor | Males; n=560 243 (85.2) | Females; n=97 174 (14.8) | ||
| No discharge 386 436 (69.0) | Discharged 173 807 (31.0) | No discharge 66 833 (68.8) | Discharged 30 341 (31.2) | |
| Ankylosing spondylitis | ||||
| Yes | 146 (55.3) | 118 (44.7) | 33 (56.9) | 25 (43.1) |
| No | 386 290 (69.0) | 173 689 (31.0) | 66 800 (68.8) | 30 316 (31.2) |
| P<0.001* | P=0.051* | |||
| Rheumatoid arthritis | ||||
| Yes | 303 (62.1) | 185 (37.9) | 153 (62.2) | 93 (37.8) |
| No | 386 133 (69.0) | 173 622 (31.0) | 66 680 (68.8) | 30 248 (31.2) |
| P=0.001* | P=0.026* | |||
| Psoriasis | ||||
| Yes | 1534 (69.8) | 664 (30.2) | 314 (68.3) | 146 (31.7) |
| No | 384 902 (69.0) | 173 143 (31.0) | 66 519 (68.8) | 30 195 (31.2) |
| P=0.408* | P=0.811* | |||
| Systemic lupus erythematosus | ||||
| Yes | 59 (62.8) | 35 (37.2) | 95 (66.9) | 47 (33.1) |
| No | 386 377 (69.0) | 173 772 (31.0) | 66 738 (68.8) | 30 294 (31.2) |
| P=0.193* | P=0.629* | |||
| Diabetes mellitus | ||||
| Yes | 1175 (55.5) | 942 (44.5) | 259 (61.1) | 165 (38.9) |
| No | 385 261 (69.0) | 172 865 (31.0) | 66 574 (68.8) | 30 176 (31.2) |
| P<0.001* | P=0.001* | |||
*Results of χ2 tests.