| Study cluster | Age of rice mills | |||||||||||
| Up to 5 years | 6 - 10 years | 11 - 19 years | More than 20 years | |||||||||
| Large | Medium | Small | Large | Medium | Small | Large | Medium | Small | Large | Medium | Small | |
| Eastern Terai | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 4 | 2 | 4 | 0 |
| Central Terai | 3 | 0 | 2 | 1 | 1 | 2 | 0 | 3 | 1 | 2 | 0 | 1 |
| Western Terai | 0 | 2 | 1 | 1 | 4 | 0 | 0 | 1 | 3 | 1 | 5 | 1 |
| Total | 3 | 2 | 4 | 3 | 5 | 3 | 1 | 5 | 8 | 5 | 9 | 2 |