Table 1 Attributes of the respondents
| Respondents (%) | |||
|---|---|---|---|
| 2011 | 2012 | ||
| Sex | |||
| Male | 212 (42) | 376 (41) | |
| Female | 290 (58) | 532 (59) | |
| Area | |||
| Hokkaido | ― | ― | |
| Tohoku | ― | ― | |
| Kanto | 134 (27) | 568 (62) | |
| Hokuriku | ― | ― | |
| Tokai | 20 (4) | 0 (0) | |
| Kinki | 196 (39) | 89 (10) | |
| Chugoku/Shikoku | 31 (6) | 114 (13) | |
| Kyusyu/Yamaguchi | 121 (24) | 137 (15) | |
| 502 (100) | 908 (100) | ||