資料Ⅲ‑3
第 18 回国際疫学会学術総会（ブラジル・ポルトアレグレ）2008.9.20～24
18th IEA (International Epidemiological Association) World Congress of Epidemiology (EPI 2008)

Factors associated with participation in volunteer disaster response activities
Toshiyuki Ojima, Chiyoe Murata, Shinya Hayasaka, Tomoko Haraoka, Yousuke Shibata, Tatsuya Noda, Machiko
Miwa (Hamamatsu University School of Medicine)
Introduction: Historically, Japan has experienced many earthquakes and floods. For the Great Hanshin-Awaji
Earthquake in 1995, an estimated 14 million non-professional volunteers participated in disaster response activities.
After this earthquake, many volunteers have participated in disaster response or preparation activities in Japan.
Objectives: To reveal factors related to participation in such activities.
Methods: Micro data of the Survey on Time Use and Leisure Activities conducted in 2001 was used, which wasprovided by the Research Centre for Information and Statistics of Social Science, Institute of Economic Research,Hitotsubashi University with the permission of the Ministry of Internal Affairs and Communications. Subjects of thesurvey were aged 10 years or older randomly selected from all over Japan. Number of respondents was 146,065.
Self-administered questionnaires were distributed and collected by home visit of official investigators. Multiple logistic
regression analyses were conducted to adjust for sex and age groups.
Results: Participation rates of volunteer disaster response or preparation activities were 1.3% and 1.5% for male andfemale, respectively. Participation rates by age groups were 1.2%, 1.8%, 1.4% and 0.3% for aged under 20, 20+, 40+,60+, and 80+, respectively. Odds ratios (OR) (95% confidence interval) for participating in such activities adjusting forsex and age groups were as follows. When housewives and persons without jobs were set as a reference, respective
ORs were 1.291 (1.141-1.461) and 1.345 (1.163-1.556) for full- and part-time workers. When not married group was areference, such ORs were 1.284 (1.097-1.504) and 1.030 (0.824-1.287) for married and widowed or divorced groups.
We conducted analyses by education level and income as well. When less than high school education group was areference, respective ORs were 1.288 (1.147-1.448) and 1.859 (1.628-2.122) for high school and college or higher
education groups. When a group with annual income less than 2 million Japanese yen was a reference, respective ORs
were 1.304 (1.101-1.544), 1.466 (1.229-1.748), and 1.970 (1.634-2.375) for 2+ million yen, 6+ million yen, and 10+million yen groups.
Conclusion: Middle aged high income workers were more likely to participate in volunteer disaster response orpreparation activities in Japan.
Fig 1 Odds ratios of participation ofvolunteer disaster response activities
0.00.5

1.0Fig 2 Odds ratios of participation of volunteer
disaster response activities (cont’d)

1.5

0.5

SexMale1.00

Female<20Age

1.06

20+

1.00

40+

1.55

60+
80+

1.18

not married
Maritalmarriedstatus widowed or divorced

1.00

school
Educationless thanhihigh
gh school
history
college or higher

1.00<2 million Jap Yen
2+ million Jap Yen
6+ millon Jap Yen
10+ million Jap Yen

1.00

Annualincome

0.24

1.5

1.00

Working
status1.24

1.0

without jobs
full- time worker
part- time worker

2.0

1.29
1.34

1.03

1.28

1.29
1.86
1.30
1.47

1.97

Odds ratio and 95% confidence interval; sex and age were in the model
Odds ratio and 95% confidence interval ; sex and age were adjusted respectively.

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