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% | |||