TABLE 1.
Sociodemographic characteristics of the samples.
| Cohort | 0 | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|---|
| pre‐pandemic | Apr/May 2020 | Nov/Dec 2020 | Mar/Apr 2021 | Nov/Dec 2021 | Mar/Apr 2022 | |
| NTR | ||||||
| N total | 13,950 | 1791 | 536 | 714 | 855 | 883 |
| N after random selection a | 13,362 | 1333 | 222 | 347 | 426 | 458 |
| Male | 49.5% | 49.3% | 49.6% | 55.0% | 47.4% | 49.6% |
| Female | 50.5% | 50.7% | 50.4% | 45.0% | 52.6% | 50.4% |
| M Age (SD) | 11.6 (1.3) | 10.7 (1.8) | 10.3 (2.0) | 10.1 (2.1) | 10.9 (2.2) | 11.1 (1.9) |
| Country of birth parents (both Dutch) b | 88.8% | 83.4% | 83.3% | 73.8% | 83.8% | 81.2% |
| Educational level parents low c | 20.5% | 3.9% | 1.4% | 5.2% | 0.0% | 4.8% |
| Educational level parents intermediate c | 38.2% | 29.9% | 38.6% | 31.0% | 30.0% | 14.3% |
| Educational level parents high c | 41.3% | 66.2% | 60.0% | 63.8% | 70.0% | 81.0% |
| KLIK | ||||||
| N total | 2401 | 856 | 939 | 909 | 828 | 893 |
| N after random selection a | 2401 | 486 | 440 | 413 | 414 | 529 |
| Male | 50.3% | 47.9% | 50.2% | 52.1% | 50.5% | 54.1% |
| Female | 49.7% | 52.1% | 49.8% | 47.9% | 49.5% | 45.9% |
| M Age (SD) | 13.1 (3.1) | 13.5 (2.9) | 13.8 (3.2) | 13.6 (3.3) | 13.6 (3.1) | 13.4 (3.1) |
| Country of birth parents (both Dutch) | 93.0% d | 92.6% | 92.0% | 88.6% | 94.7% | 90.7% |
| Educational level parents low | 19.3% d | 2.9% | 0.6% | 4.2% | 1.9% | 1.2% |
| Educational level parents intermediate | 39.0% | 28.2% | 29.4% | 26.6% | 25.2% | 22.3% |
| Educational level parents high | 41.6% | 68.8% | 70.0% | 69.2% | 72.9% | 76.5% |
| DREAMS | ||||||
| N total | – | 500 | 892 | 661 | 632 | 450 |
| N after random selection a | – | 453 | 748 | 505 | 482 | 334 |
| Male | – | 54.3% | 53.5% | 59.6% | 53.7% | 47.0% |
| Female | – | 45.7% | 46.5% | 40.4% | 46.3% | 53.0% |
| M Age (SD) | – | 13.3 (3.1) | 13.6 (2.9) | 13.0 (2.9) | 13.2 (3.0) | 13.3 (2.9) |
| Country of birth parents (both Dutch) | – | 84.3% | 88.4% | 86.2% | 85.4% | 84.5% |
| Educational level parents low | – | 4.8% | 5.6% | 6.3% | 6.9% | 6.5% |
| Educational level parents intermediate | – | 40.3% | 45.6% | 42.4% | 44.4% | 38.1% |
| Educational level parents high | – | 54.9% | 48.8% | 51.3% | 48.7% | 55.4% |
Note: Statistics represent the samples after random selection of a single measurement moment for each participant.
Abbreviations: M, mean; N, number of participants; SD, standard deviation.
a
Number of participants after random selection of one measurement for each individual participant.
b
4%–13% of data are missing per measurement. Shown percentages are valid percentages (excluding missing cases).
c
4%–25% of data are missing per measurement. Shown percentages are valid percentages (excluding missing cases).
d
Sample size is smaller (N = 1082) as data were not collected in norm studies for PROMIS anxiety and depressive symptoms.