Representativeness and Demographics
| Responders | Nonresponders | p Value | |
| Age, y | n = 314 | n = 589 | 0.061 |
| Mean | 30.9 | 31.3 | |
| Median | 30.0 | 31.0 | |
| SD | 3.5 | 3.3 | |
| Sex, % | n = 314 | n = 589 | 0.880 |
| Female | 61.5 | 61.0 | |
| Region, % | n = 314 | n = 589 | 0.244 |
| Northern Europe | 4.8 | 6.3 | |
| Southern Europe | 40.5 | 40.8 | |
| Eastern Europe | 23.3 | 21.9 | |
| Western Europe | 23.3 | 26.2 | |
| Other | 8.3 | 4.9 | |
| Career stage, % | n = 314 | n = 508 | 0.395 |
| Neurology resident | 48.7 | 39.2 | |
| Neurologist | 31.9 | 31.9 | |
| Research fellow/PhD student | 19.8 | 17.8 |
Comparisons tested using Mann-Whitney for continuous variables (age) and χ2 for categorical variables (sex, region, career stage). Geographic region was assigned according to the United Nations Geoscheme.