Table 1.
Descriptive statistics of the study population: demographics, trait self-control constructs and delay and probability discounting
| Demographics | Total | n | |
|---|---|---|---|
| Gender |
Female Male |
5021 (59%) 3432 (41%) |
8453 |
| Age |
< 40 40–59 60 + |
1607 (19%) 5109 (60%) 1737 (21%) |
8453 |
| Country of birth |
Netherlands Other |
8168 (98%) 160 (2%) |
8328 |
| Educational level |
Lower Middle Higher |
1892 (23%) 3069 (37%) 3285 (40%) |
8246 |
| Batch |
Participated in 2019 Participated in 2021 |
2366 (28%) 6087 (72%) |
8453 |
| Trait self-control constructs | |||
| Brief self-control scale short-form (range: 7–35) | 24.25 (3.69) | 8194 | |
| Grit scale short-form (range: 1–5) | 3.65 (0.50) | 8162 | |
| Delaying gratification inventory short-form (range 10–50) | 35.32 (4.15) | 8146 | |
| Abbreviated impulsiveness scale (range 13–52) | 38.84 (4.86) | 8178 | |
| Risk propensity scale (range 1–9) | 6.45 (1.29) | 8177 | |
| Delay discounting measures | |||
| Present bias (continuous measure ≥ 0) | 1.00 (0.12) | 6465 | |
| Delta (exponential discount factor) (continuous measure ≥ 0) | 0.95 (0.15) | 6465 | |
| Probability discounting measure | |||
| Risk premium (continuous measure) | −0.037 (0.558) | 7908 | |
Frequencies and percentages for categorical variables and means and standard deviation for continuous variables.