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Table 1 Characteristics of the subjects (n = 2,083)

From: Impaired psychological recovery in the elderly after the Niigata-Chuetsu Earthquake in Japan:a population-based study

   N %
Gender Male 1,137 54.6
  Female 927 44.5
Age (years) ≤29 59 2.8
  30–39 184 8.8
  40–49 333 16.0
  50–64 802 38.5
  65–79 623 29.9
  ≥80 66 3.2
Place of residence when the earthquake occurred
  Nagaoka City 727 34.9
  Ojiya City 442 21.2
  Mitsuke City 171 8.2
  Tohkamachi City 248 11.9
  Kawaguchi Town 146 7.0
  Koshiji Town 108 5.2
  Yamakoshi Village 216 10.4
Employment Farmer 236 11.3
  Executive of business firm 128 6.1
  Office worker 461 22.1
  Government official 54 2.6
  Part-time worker 167 8.0
  Housewife 303 14.5
  Student 5 0.2
  None 201 9.6
  Pensioner 295 14.2
Location when the earthquake occurred
  At home 1,426 68.5
  At home of friends 30 1.4
  At office 132 6.3
  In Car 169 8.1
  In bus or train 8 0.4
  In public facilities 29 1.4
  In other buildings 71 3.4
  Outdoors 78 3.7
Person by their side when the earthquake occurred
  With someone 317 15.2
  Alone 1,766 84.8
Family members living together
  None 847 40.7
Income    
  Lost income after earthquake 21 1.0
Severity of house damage Completely destroyed 356 17.1
  Almost completely destroyed 292 14.0
  Severely damaged 621 29.8
  Slightly damaged 787 37.8
  None 14 0.7
Timing of contact with lifeguards after the earthquake
  ≤1 hour 139 6.7
  1< ≤ 3 hours 263 12.6
  3< ≤ 6 hours 187 9.0
  6< ≤ 12 hours 204 9.8
  > 12 hours 998 47.9
  No contact 279 13.4
Injury caused by the earthquake No injury 1,888 90.6
  Mild injury 191 9.2
  Injury requiring hospitalization 4 0.2
Sickness after the earthquake No sickness 1,870 89.8
  Mild sickness 195 9.4
  Sickness requiring hospitalization 18 0.9