Table 2. Breakdown of the WD patients by altitude of residence and comparison with the general Sardinian population (absolute counts are first reported, with percentages in parentheses).
| Areaa | Patients sampleb | Sardinian populationc |
|---|---|---|
| Plains | 87 (48.88) | 816 442 (48.82) |
| Coastal hills | 28 (15.73) | 442 291 (26.45) |
| Internal hills | 48 (26.97) | 351 942 (21.04) |
| Mountains | 15 (8.43) | 61 729 (3.69) |
| Total | 178 (100) | 1 672 404 (100) |
Abbreviation: WD, Wilson disease.
a
See online Supplementary Information (Supplementary Table S1) for details on the definition criteria of altitudinal areas.
b
Detailed and unambiguous information on the geographical origins was available only for 178 patients.
c
Original data from Italian National Institute of Statistics.15