| VORDERMAN'S DATA
| # of prisons | # with beriberi | percentage of prisons w/ beriberi | frequency among prisoners
half- polished rice | 35 | 1 | 2.7% | 1 in 10,000
mixture | 13 | 6 | 46.1% | 1 in 416
polished rice | 51 | 36 | 70.6% | 1 in 39
| # of prisons | # of prisons where beriberi found | percentage of prisons w/ beriberi
Age of Buildings | 40-100 | 26 | 13 | 50.0%
21-40 | 32 | 11 | 34.4%
2-10 | 42 | 19 | 45.2%
Floors | impermeable | 58 | 24 | 41.4%
partly permeable | 13 | 7 | 53.9%
permeable | 29 | 12 | 41.4%%
Ventilation | good | 68 | 28 | 41.2%
medium | 11 | 8 | 72.7%
faulty | 21 | 7 | 33.3%
Population Density | sparsely populated | 73 | 32 | 44.6%
medium | 1 | 1 |
overcrowded | 26 | 9 | 34.6%