Number of children in the Belgian and Norwegian sample
| Belgium | Norway | |||||
|---|---|---|---|---|---|---|
| Age | Boys | Girls | Total | Boys | Girls | Total |
| 0–1 | 999 | 951 | 1949 | 601 | 558 | 1159 |
| 1–2 | 340 | 338 | 678 | 132 | 141 | 273 |
| 2–3 | 320 | 317 | 637 | 151 | 120 | 271 |
| 3–4 | 328 | 369 | 697 | 125 | 145 | 270 |
| 4–5 | 427 | 366 | 793 | 131 | 127 | 258 |
| Total | 2414 | 2340 | 4754 | 1140 | 1091 | 2231 |