| Criteria | Age range (years) | |||||||||||||||
| 12 - 20 | 21 - 30 | 31 - 40 | 41 - 50 | 51 - 60 | 61 - 70 | >70 | Total | |||||||||
| n | % | n | % | n | % | n | % | n | % | n | % | n | % | n | % | |
| Normal | 5.8 | 1 | 3.5 | 1 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 |
| Questionable | 17.6 | 3 | 3.5 | 1 | 0.0 | 0 | 4 | 1 | 5.8 | 1 | 0 | 0 | 0 | 0 | 6 | 6 |
| Very Mild | 11.7 | 2 | 3.5 | 1 | 12.5 | 1 | 12 | 3 | 17.6 | 3 | 0 | 0 | 0 | 0 | 8 | 8 |
| Mild | 17.6 | 3 | 17.8 | 5 | 12.5 | 1 | 12 | 3 | 5.8 | 1 | 0 | 0 | 0. | 0 | 13 | 13 |
| Moderate | 0.0 | 0 | 35.7 | 10 | 12.5 | 1 | 24 | 6 | 5.8 | 1 | 0 | 0 | 33.3 | 1 | 19 | 19 |
| Severe | 47.0 | 8 | 35.7 | 10 | 62.5 | 5 | 48 | 12 | 64.7 | 11 | 100 | 5 | 66.6 | 2 | 52 | 52 |
| Total | 100 | 17 | 3.5 | 1 | 100 | 8 | 100 | 25 | 100 | 17 | 100 | 5 | 100 | 3 | 100 | 100 |
| DF prevalence | 100 | 15 | 88.8 | 8 | 88.2 | 45 | 96 | 24 | 92 | 92 |
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