Table 4. Full model~: Sequential Multiple Regression including pre-deployment variables (Model 1), deployment variables (Model 2) and post-deployment variables (Model 3), odds ratios (OR) (and 95% confidence intervals (CI)).
| Model 1: pre- deployment factors |
Model 2: Model 1 plus deployment factors |
Model 3: Model 2 plus post- deployment factors |
|
|---|---|---|---|
|
| |||
| Childhood adversity | |||
| 0/1 | 1 | 1 | 1 |
| 2/3 | 0.95 (0.55-1.61) | 0.91 (0.52-1.62) | 0.87 (0.48-1.56) |
| 4/5 | 1.84 (1.14-2.94) | 1.37 (0.80-2.33) | 1.26 (0.73-2.18) |
| 6+ | 3.22 (2.01-5.15)* | 2.35 (1.39-3.98) | 2.34 (1.38-4.00) |
|
| |||
| Time spent in a “forward area” |
|||
| None | 1 | 1 | |
| Up to 1 week | 2.16 (1.05-4.44) | 2.05 (0.99-4.25) | |
| 1 week-1 month | 2.45 (1.25-4.80) | 2.05 (1.03-4.08) | |
| >1 month | 3.33 (1.75-6.36) | 3.10 (1.60-5.97) | |
|
| |||
| Work in theatre matched trade and experience |
|||
| Yes | 1 | 1 | |
| No, above | 2.65 (1.50-4.70) | 2.72 (1.51-4.90) | |
| No, below | 1.31 (0.70-2.47) | 1.18 (0.59-2.32) | |
| No, outside | 1.06 (0.47-2.39) | 0.89 (0.37-2.11) | |
|
| |||
| Thought might be killed |
|||
| No | 1 | 1 | |
| Yes | 2.81 (1.66-4.78) | 3.01 (1.73-5.24) | |
|
| |||
| Number of “risk to self” events |
|||
| 0 | 1 | 1 | |
| 1 | 1.11 (0.55-2.26) | 0.98 (0.48-2.02) | |
| 2 | 0.76 (0.35-1.67) | 0.68 (0.30-1.51) | |
| ≥3 | 1.00 (0.45-2.22) | 0.95 (0.42-2.12) | |
|
| |||
| Number of “trauma involving others” events |
|||
| 0 | 1 | 1 | |
| 1 | 1.67 (0.94-2.96) | 1.76 (0.97—3.19) | |
| 2 | 1.69 (0.91-3.12) | 1.79 (0.94-3.40) | |
| ≥3 | 2.18 (1.25-3.82) | 2.35 (1.32-4.20) | |
|
| |||
| Tertiles of “morale” | |||
| Highest | 1 | 1 | |
| Middle | 1.54 (0.89-2.66) | 1.52 (0.87-2.63) | |
| Lowest | 3.19 (1.95-5.21) | 3.15 (1.92-5.18) | |
|
| |||
| Deployed with parent unit |
|||
| No | 1 | 1 | |
| Yes | 0.88 (0.59-1.32) | 0.96 (0.63-1.45) | |
|
| |||
| Nature of duty | |||
| Combat | 1 | 1 | |
| Combat support | 1.07 (0.54-2.10) | 1.0 (0.50-2.00) | |
| Combat service support |
1.01 (0.64-1.59) | 0.93 (0.58-1.47) | |
|
| |||
| Non-receipt of Homecoming brief |
0.93 (0.86-1.02) | ||
|
| |||
| Time spent on base location before deployment leave |
0.83 (0.68-1.02) | ||
~
Officers were excluded due the presence of statistically significant interaction
*
NB these estimates are different from those presented in table 1 because officers were excluded from the analysis.
Model 1 is adjusted for age, sex, rank, service arm, education, and marital status.
Model 2 is adjusted for model 1 plus all variables in model 2
Model 3 is adjusted for model 1, model 2, and all variables in model 3.