5 years before the earthquake | 3 years after the earthquake | Change in mortality | |
Oct 1999– Sept 2004 | Oct 2004–Sept 2007 | ||
Men and women | |||
Disaster area* | |||
Number of deaths from AMI | 1608 | 1074 | |
Population (person-years) | 3 401 257 | 1 991 109 | |
Mortality rate (/100 000 person-years) | 47.3 | 53.9 | +6.6 (+14.0%) χ2 = 11.21, p = 0.0008 |
Control area† | |||
Number of deaths from AMI | 3795 | 2254 | |
Population (person-years) | 8 932 172 | 5 287 967 | |
Mortality rate (/100 000 person-years) | 42.5 | 42.6 | +0.1 (+0.2%) χ2 = 0.01, p = 0.9028 |
Men | |||
Disaster area* | |||
Number of deaths from AMI | 882 | 586 | |
Population (person-years) | 1 662 025 | 972 663 | |
Mortality rate (/100 000 person-years) | 53.1 | 60.2 | +7.1 (+13.4%) χ2 = 5.67, p = 0.0172 |
Control area† | |||
Number of deaths from AMI | 2043 | 1258 | |
Population (person-years) | 4 321 693 | 2 550 512 | |
Mortality rate (/100 000 person-years) | 47.3 | 49.3 | +2.0 (+4.2%) χ2 = 1.40, p = 0.2362 |
Women | |||
Disaster area* | |||
Number of deaths from AMI | 726 | 488 | |
Population (person-years) | 1 739 232 | 1 018 446 | |
Mortality rate (/100 000 person-years) | 41.7 | 47.9 | +6.2 (+14.9%) χ2 = 5.56, p = 0.0184 |
Control area† | |||
Number of deaths from AMI | 1752 | 996 | |
Population (person-years) | 4 610 479 | 2 737 455 | |
Mortality rate (/100 000 person-years) | 38.0 | 36.4 | −1.6 (−4.2%) χ2 = 1.20, p = 0.2735 |
*Chuetsu Region, including Nagaoka City, Kashiwazaki City, Ojiya City, Tokamachi City, Mitsuke City, Uonuma City, Minamiuonuma City, Kawaguchi Town, Yuzawa Town, Tsunan Town and Kariwa Village, in Niigata Prefecture. †The other areas in Niigata Prefecture.