Table 1 Chi-square difference tests between our sample and the population based on the stratification criteria institution and sex
Stratification criteria | Total population (N = 87,119) % (n) | Sample (n = 19,253) % (n) | P-value (χ2 test) |
|---|---|---|---|
Institution | Â | Â | < 0.001 |
 University of Antwerp | 13.05% (11,366) | 9.85% (1896) |  |
 University of Ghent | 30.56% (26,627) | 37.30% (7181) |  |
 University of Leuven | 35.34% (30,785) | 26.95% (5189) |  |
 ‘KdG’ College | 11.89% (10,359) | 11.68% (2249) |  |
 ‘KHLimburg’ College | 6.34% (5521) | 10.84% (2087) |  |
 ‘Group T’ College | 2.82% (2461) | 3.38% (651) |  |
Sex | Â | Â | < 0.001 |
 Men | 44.97% (39,176) | 35.67% (6867) |  |
 Women | 55.03% (47,943) | 64.33% (12,386) |  |