Table 1 Baseline characteristics before the disaster
| Â | Victims | Non-victims | P value |
|---|---|---|---|
All participants n | 32,499 | 5,255,389 | Â |
 Age group |  |  |  |
  15–19 n, (%) | 1264 (3.9) | 286,495 (5.5) | < 0.001 |
  20–39 n, (%) | 4654 (14.3) | 1,302,881 (24.8) |  |
  40–64 n, (%) | 10,185 (31.3) | 1,870,036 (35.6) |  |
  65–79 n, (%) | 11,237 (34.6) | 1,183,566 (22.5) |  |
  80- n, (%) | 5159 (15.9) | 612,411 (11.7) |  |
 Male n, (%) | 14,176 (43.6) | 2,449,648 (46.6) | < 0.001 |
 Total number of prescriptions Median (IQR) | 7 (1–13) | 3 (0–11) | < 0.001 |
Non-users* n, (%) | 32,214 (99.1) | 5,222,326 (99.4) | < 0.001 |
 Age group |  |  |  |
  15–19 n, (%) | 1252 (3.9) | 284,480 (5.5) | < 0.001 |
  20–39 n, (%) | 4613 (14.3) | 1,295,913 (24.8) |  |
  40–64 n, (%) | 10,086 (31.3) | 1,859,500 (35.6) |  |
  65–79 n, (%) | 11,156 (34.6) | 1,175,467 (22.5) |  |
  80- n, (%) | 5107 (15.9) | 606,966 (11.6) |  |
 Male n, (%) | 14,058 (43.6) | 2,433,409 (46.6) | < 0.001 |
 Total number of prescriptions Median (IQR) | 7 (1–13) | 3 (0–11) | < 0.001 |
Pre-disaster users†n, (%) | 285 (0.88) | 33,063 (0.63) | < 0.001 |
 Age group |  |  |  |
  15–19 n, (%) | 12 (4.2) | 2015 (6.1) | 0.03 |
  20–39 n, (%) | 41 (14.4) | 6968 (21.1) |  |
  40–64 n, (%) | 99 (34.7) | 10,536 (31.9) |  |
  65–79 n, (%) | 81 (28.4) | 8099 (24.5) |  |
  80- n, (%) | 52 (18.3) | 5445 (16.5) |  |
 Male n, (%) | 118 (41.4) | 16,239 (49.1) | 0.01 |
 Total number of prescriptions Median (IQR) | 14 (8–21) | 13 (6–21) | 0.13 |
 Agents for IBS |  |  |  |
  Ramosetron | 62 (21.8) | 7182 (21.7) | < 0.001 |
  Polycarbophil calcium | 129 (45.3) | 17,661 (53.4) |  |
  Mepenzolate bromide | 79 (27.7) | 5674 (17.2) |  |
  Any concurrent uses | 15 (5.3) | 2546 (7.7) |  |
 Prescription days‡ |  |  |  |
  0–100 n, (%) | 188 (66) | 21,148 (64) | 0.21 |
  101–200 n, (%) | 16 (5.6) | 2828 (8.6) |  |
  201- n, (%) | 81 (28.4) | 9087 (27.5) |  |