Table 2 The prevalence and odds ratios for psychological distress (K6 score > =5)

Gender

  Male

167/402 (41.5)

1.00

1.00

  Female

265/498 (53.2)

1.61

(1.21-2.14)**

1.43

(1.04-1.97)*

Age, year

  Young: 20-39

41/115 (35.7)

1.00

1.00

  Middle-aged: 40-59

129/269 (48.0)

1.66

(1.04-2.64)*

1.54

(0.94-2.54)

  Elderly: 60+

262/516 (50.8)

1.87

(1.19-2.93)**

1.21

(0.72-2.03)

Education

  University graduates or higher

29/100 (29.0)

1.00

1.00

  High school/Technical or Two-year college

286/594 (48.1)

2.26

(1.40-3.65)***

2.16

(1.31-3.53)**

  Junior high school or less

117/206 (56.8)

3.20

(1.84-5.56)***

2.80

(1.58-4.97)***

Employment status

  Permanent employee

186/451 (41.2)

1.00

1.00

  Non-permanent employee/House keeper/Student

108/206 (52.4)

1.55

(1.08-2.21)*

1.28

(0.86-1.90)

  Unemployed/Retired

138/243 (56.8)

1.87

(1.32-2.64)***

1.84

(1.22-2.76)**

Number of house occupants (people including the respondent)

  5+

90/191 (47.1)

1.00

1.00

  3-4

151/332 (45.5)

0.94

(0.62-1.42)

0.86

(0.56-1.33)

  1-2

191/377 (50.7)

1.17

(0.79-1.72)

0.98

(0.63-1.52)

House damage due to earthquakes

  Nothing

163/383 (42.6)

1.00

1.00

  Damaged (partially/half-collapsed/fully-collapsed)

269/517 (52.0)

1.47

(1.12-1.93)**

1.42

(1.06-1.88)*

Anxiety about radioactive contamination

  Low anxiety (0 nothing/1 slightly)

157/406 (38.7)

1.00

1.00

  High anxiety (2 moderately/3 strongly)

274/494 (55.5)

1.97

(1.49-2.61)***

1.92

(1.43-2.59)***

Interaction between house damage and anxiety about radioactive contamination

  Any other

255/603 (42.3)

-

-

1.00

  Dual-disaster damage (Damaged and high anxiety)

177/297 (59.6)

-

-

1.11

(0.63-1.95)