Table 3. Summary of Hierarchical Regression Analysis for Variables Predicting Depression Symptom (N=119).

Independent Variables	R2	ΔR2	F change	β (Step 1)	β (Step 2)	β (Step 3)	β (Step 4)
Step 1 Control Variables	0.35	0.35	28.35***
PTSD Symptoms at 12 months				0.49**	0.43***	0.38***	0.35**
Baseline Depression				0.21*	0.17**	0.15	0.13
Step 2 Pre-academy	0.42	0.07	13.41***
Childhood Trauma					0.28***	0.26***	0.20*
Step 3 Academy	0.46	0.04	3.28*
Neuroticism						0.01	0.01
Self-Worth						-0.19*	-0.19*
Step 4 Police service	0.49	0.03	2.05
Negative Life Event							0.08
Work Stress							0.18*
Critical Incident							-0.03

^*p<0.05,

^**p<0.01,

^***p<0.001