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Sample size per year: persons with basic mandatory health insurance enrolled with the Helsana group
| Year | Sample (N) | MS patients (N) |
|---|---|---|
| 2011 | 925,003 | 1,262 |
| 2012 | 944,621 | 1,354 |
| 2013 | 947,723 | 1,338 |
| 2014 | 940,086 | 1,494 |
| 2015 | 943,639 | 1,606 |
Abbreviation: MS, multiple sclerosis.
