Table 3.
Risk bin descriptive statistics.
| Variable | Levels | Risk bins | P -values | ||||||
|---|---|---|---|---|---|---|---|---|---|
| One (n = 247) | Two (n = 246) | Three (n = 247) | Four (n = 247) | Omnibus | One vs. two | One vs. three | One vs. four | ||
| Paygrade | Officer | 26.3% | 6.9% | 8.9% | 10.1% | 0.001 | 0.001 | 0.001 | 0.002 |
| E5-E9 | 19.4% | 16.7% | 17.0% | 21.1% | |||||
| E1-E4 | 54.3% | 76.4% | 74.1% | 68.8% | |||||
| Occupation | Combat arms | 67.6% | 32.9% | 27.9% | 19.8% | 0.001 | 0.001 | 0.001 | 0.001 |
| Combat Service support | 18.2% | 29.3% | 41.7% | 48.2% | |||||
| Combat support | 14.2% | 37.8% | 30.4% | 32.0% | |||||
| Gender | Male | 99.6% | 96.7% | 78.5% | 70.9% | 0.001 | 0.668 | < 0.001 | < 0.001 |
| Female | 0.4% | 3.3% | 21.5% | 29.1% | |||||
| Marital status | Single | 79.4% | 72.4% | 59.9% | 55.5% | 0.001 | 1.00 | < 0.001 | < 0.001 |
| Married | 20.6% | 27.6% | 40.1% | 44.5% | |||||
| Race | White | 89.1% | 80.5% | 69.6% | 53.4% | 0.001 | 0.256 | 0.001 | 0.001 |
| Asian or Pacific Islander | 3.2% | 8.1% | 3.6% | 6.5% | |||||
| Black | 6.5% | 11.4% | 24.7% | 36.4% | |||||
| American Indian or Alaskan native | 0.8% | – | 1.6% | 0.8% | |||||
| Unknown | 0.4% | – | 0.4% | – | |||||
| Other | – | – | – | 2.8% | |||||
| Prior MSKI | No | 100.0% | 98.4% | 89.9% | 50.2% | 0.001 | 1.00 | < 0.001 | < 0.001 |
| Yes | – | 1.6% | 10.1% | 49.8% | |||||
| Nicotine use | No | 57.9% | 67.5% | 76.9% | 71.3% | 0.005 | 0.901 | 0.001 | 0.120 |
| Yes | 42.1% | 32.5% | 23.1% | 28.7% | |||||
| ACFT fail | No | 86.6% | 85.0% | 81.4% | 76.1% | 0.469 | 1.00 | 1.00 | 0.167 |
| Yes | 13.4% | 15.0% | 18.6% | 23.9% | |||||
| ACFT pain | No | 99.2% | 96.3% | 88.3% | 57.9% | 0.001 | 0.944 | < 0.001 | < 0.001 |
| Yes | 0.8% | 3.7% | 11.7% | 42.1% | |||||
| Surgery | No | 100.0% | 99.2% | 98.8% | 89.1% | 0.001 | 1.00 | 1.00 | < 0.001 |
| Yes | – | 0.8% | 1.2% | 10.9% | |||||
| MSKI profile | No | 100.0% | 99.2% | 91.9% | 54.3% | 0.001 | 1.00 | < 0.001 | < 0.001 |
| Yes | – | 0.8% | 8.1% | 45.7% | |||||
| Stress fracture | No | 98.0% | 93.9% | 95.5% | 82.2% | 0.001 | 0.706 | 1.00 | < 0.001 |
| Yes | 2.0% | 6.1% | 4.5% | 17.8% | |||||
| Movement pain | 0 | 99.6% | 98.4% | 83.4% | 35.6% | 0.001 | 1.00 | 0.001 | 0.001 |
| 1 | 0.4% | 1.6% | 14.2% | 36.8% | |||||
| 2 | – | – | 2.0% | 15.8% | |||||
| 3 | – | – | 0.4% | 11.7% | |||||
| Age (years) | 22.9 ± 4.5 | 23.1 ± 5.1 | 24.3 ± 5.1 | 25.6 ± 6.4 | < 0.001 | 1.00 | 0.063 | < 0.001 | |
| Mass (kg) | 76.1 ± 10.3 | 78.7 ± 9.5 | 79.0 ± 12.4 | 78.0 ± 13.1 | 0.668 | 0.167 | 0.182 | 1.00 | |
| Height (cm) | 176.8 ± 7.1 | 176.0 ± 7.9 | 174.5 ± 9.3 | 173.2 ± 9.4 | 0.001 | 1.00 | 0.112 | < 0.001 | |
| Sleep (hours) | 6.6 ± 0.9 | 6.6 ± 1.0 | 6.2 ± 1.0 | 6.0 ± 1.1 | < 0.001 | 1.00 | < 0.001 | < 0.001 | |
Descriptive statistics for each risk bin from the Cox proportional hazards regression model; categorical predictors are proportions (%) across the grouping feature, Fisher's exact test across risk bins; numeric features are means ± standard deviation, one-way ANOVA across risk bins; dashed line (–) denotes, “no value”.