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. 2018 May 3;41(7):zsy084. doi: 10.1093/sleep/zsy084

Table 1.

Descriptive traits of Iwanuma cohort (n = 3547)

Variables N % Variables N %
Pre-disaster socio-demographics Disaster damage
 Gender  Financial hardship
  Male 1542 43.5%   Yes 821 23.7%
  Female 2005 56.5%   No 2640 76.3%
 Age  Home destruction
  65–74 years 2122 59.8%   Half destroyed or worse 543 15.8%
  75 years or older 1425 40.2%   Partially destroyed 1487 43.1%
 Marital status   No damage 1417 41.1%
  Married 2445 71.4%  Health care disruption
  Unmarried 981 28.6%   Yes 453 12.8%
 Education   No 3094 87.2%
  <6 years 45 1.3%  Loss of close relatives/friends
  6–9 years 1174 34.4%   Yes 1321 37.2%
  10–12 years 1484 43.5%   No 2226 62.8%
  >12 years 709 20.8% Post-disaster sleep problems
 Equivalised income  Short sleep duration
  < 2 million JPY 1413 48.8%   Yes 302 8.7%
  2–4 million JPY 1200 41.4%   No 3168 91.3%
  >4 million JPY 284 9.8%  Sleep insufficiency
Pre-disaster lifestyle   Yes 462 13.4%
 Smoking status   No 2979 86.6%
  Current 363 11.2%  Poor sleep quality
  Used to 898 27.6%   Yes 942 27.0%
  Never 1990 61.2%   No 2541 73.0%
 Drinking status  Insomnia symptoms
  Current 1272 36.7%   Yes 1448 41.4%
  Used to 119 3.4%   No 2052 58.6%
  Never 2075 59.9%  Sleep medication use
Pre-disaster social support   Yes 753 21.6%
 Instrumental support   No 2732 78.4%
  Yes 3314 96.0%
  No 137 4.0%
 Emotional support
  Yes 3196 93.8%
  No 212 6.2%