Background
Method
The Great East Japan earthquake
Study participants
Living and working environment of disaster workers
Psychological evaluation
Statistical analyses
Results
Participants’ characteristics
IES-R | K10 | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 month later | 6 months later | 12 months later | 1 month later | 6 months later | 12 months later | |||||||||||||||
N
| % | Mean | s.d. | p value | Mean | s.d. | p value | Mean | s.d. | p value | Mean | s.d. | p value | Mean | s.d. | p value | Mean | s.d. | p value | |
Age | ||||||||||||||||||||
< 30 | 711 | 47.2 | 6.6 | 8.3 | 0.42 | 3.3 | 4.9 | 0.77 | 2.8 | 4.4 | 0.23 | 13.0 | 4.7 | 0.24 | 11.1 | 2.7 | 0.43 | 11.0 | 2.4 | 0.55 |
30 to 39 | 311 | 20.7 | 5.8 | 7.0 | 2.9 | 4.6 | 2.8 | 4.5 | 12.5 | 3.4 | 10.7 | 2.0 | 11.0 | 2.2 | ||||||
≥ 40 | 484 | 32.1 | 5.9 | 7.3 | 3.1 | 4.4 | 3.2 | 5.1 | 12.3 | 3.7 | 11.1 | 2.4 | 11.2 | 2.5 | ||||||
Gender | ||||||||||||||||||||
Male | 1485 | 98.6 | 6.2 | 7.7 | 0.18 | 3.1 | 4.7 | 0.72 | 2.9 | 4.7 | 0.14 | 12.6 | 4.2 | 0.81 | 11.0 | 2.5 | 0.45 | 11.1 | 2.4 | 0.56 |
Female | 21 | 1.4 | 4.3 | 6.7 | 3.7 | 5.0 | 3.3 | 3.5 | 12.6 | 4.0 | 11.0 | 3.1 | 11.1 | 1.9 | ||||||
Rank | ||||||||||||||||||||
Officer | 75 | 5.0 | 5.3 | 6.5 | 0.43 | 4.2 | 5.9 | 0.15 | 3.5 | 5.6 | 0.30 | 13.3 | 5.0 | 0.28 | 11.6 | 2.9 | 0.09 | 11.3 | 2.4 | 0.10 |
Private/Sergeant | 1431 | 95.0 | 6.3 | 7.8 | 3.1 | 4.6 | 2.9 | 4.6 | 12.6 | 4.1 | 11.0 | 2.5 | 11.0 | 2.4 | ||||||
Dispatch period | ||||||||||||||||||||
< 1 month | 485 | 32.2 | 5.8 | 7.6 | <0.05 | 2.8 | 4.3 | <0.05 | 2.9 | 4.6 | 0.64 | 12.4 | 4.0 | <0.05 | 10.8 | 2.2 | <0.01 | 11.1 | 2.2 | <0.05 |
1 to 3 months | 1021 | 67.8 | 6.4 | 7.8 | 3.3 | 4.8 | 3.0 | 4.7 | 12.8 | 4.2 | 11.1 | 2.6 | 11.0 | 2.5 | ||||||
Exposure to corpses | ||||||||||||||||||||
Present | 1030 | 68.4 | 6.8 | 7.9 | <0.001 | 3.4 | 4.8 | <0.001 | 3.0 | 4.8 | 0.19 | 12.7 | 4.3 | 0.41 | 11.1 | 2.6 | 0.41 | 11.0 | 2.3 | 0.07 |
Not present | 476 | 31.6 | 5.0 | 7.1 | 2.6 | 4.3 | 2.8 | 4.4 | 12.5 | 3.9 | 11.0 | 2.3 | 11.2 | 2.6 | ||||||
Living environment | ||||||||||||||||||||
Only with troop members | 1253 | 83.2 | 5.7 | 7.3 | <0.001 | 2.9 | 4.2 | <0.01 | 2.7 | 4.4 | <0.001 | 12.4 | 3.9 | <0.001 | 10.9 | 2.1 | <0.001 | 11.0 | 2.2 | 0.08 |
Sharing the premises with the victims | 253 | 16.8 | 8.9 | 9.3 | 4.2 | 6.5 | 4.1 | 5.8 | 13.8 | 5.3 | 11.9 | 3.8 | 11.4 | 3.1 |
Chronological data analyses on IES-R and K10
1 month | 6 months | 12 months | P value | |
---|---|---|---|---|
IES-R total, mean (s.d.) | 6.2 (7.7) | 3.1 (4.7) | 2.9 (4.7) | <0.001c |
IES-R intrusion, mean (s.d.) | 2.4 (3.1) | 1.3 (2.0) | 1.2 (1.9) | <0.001c |
IES-R avoidance,mean (s.d.) | 2.3 (3.6) | 1.1 (2.3) | 1.0 (2.2) | <0.001c |
IES-R hyperarousal, mean (s.d.) | 1.5 (2.3) | 0.7 (1.5) | 0.7 (1.4) | <0.001c |
High-PTSRa group, n (%) | 56 (3.7) | 12 (0.8) | 11 (0.7) | <0.001d |
K10, mean (s.d.) | 12.6 (4.2) | 11.0 (2.5) | 11.1 (2.4) | <0.001c |
High-GPDb group, n (%) | 33 (2.2) | 8 (0.5) | 7 (0.5) | <0.001d |
Univariate analyses
Multiple logistic regression analyses
Reference | β | s.e. | Adjusted OR | 95 % CI | P value | ||
---|---|---|---|---|---|---|---|
High-PTSRa | |||||||
Gender | Female | (Male) | 0.13 | 1.05 | 1.13 | 0.15–8.83 | 0.90 |
Rank | Officer | (Private/Sergeant) | 0.30 | 0.54 | 1.35 | 0.47–3.86 | 0.57 |
Dispatch period | 1 to 3 months | (<1 month) | −0.32 | 0.27 | 0.73 | 0.43–1.22 | 0.23 |
Exposure to corpses | Present | (Not present) | 0.21 | 0.28 | 1.23 | 0.71–2.15 | 0.47 |
Living environment | Sharing the premises with the victims | (Only with troop members) | 1.22 | 0.26 | 3.39 | 2.04–5.64 | <0.001 |
High-GPDb | |||||||
Rank | Officer | (Private/Sergeant) | 0.53 | 0.62 | 1.69 | 0.50–5.69 | 0.40 |
Dispatch period | 1 to 3 months | (<1 month) | 0.33 | 0.38 | 1.39 | 0.66–2.90 | 0.38 |
Exposure to corpses | Present | (Not present) | 0.00 | 0.36 | 1.00 | 0.50–2.00 | 0.99 |
Living environment | Sharing the premises with the victims | (Only with troop members) | 1.21 | 0.33 | 3.35 | 1.77–6.34 | <0.001 |