| Age group | The supplementary questionnaire was | Total | The supplementary questionnaire was | Total | ||
|---|---|---|---|---|---|---|
| answered | not answered | answered | not answered | |||
| persons | % | |||||
| Total | ||||||
| 15–19 | 485 972 | 7 913 | 493 885 | 98.4 | 1.6 | 100.0 |
| 20–24 | 587 456 | 7 282 | 594 738 | 98.8 | 1.2 | 100.0 |
| 25–29 | 588 034 | 14 334 | 602 367 | 97.6 | 2.4 | 100.0 |
| Total | 1 661 462 | 29 528 | 1 690 990 | 98.3 | 1.7 | 100.0 |
| Male | ||||||
| 15–19 | 248 936 | 4 410 | 253 346 | 98.3 | 1.7 | 100.0 |
| 20–24 | 299 066 | 4 969 | 304 035 | 98.4 | 1.6 | 100.0 |
| 25–29 | 299 416 | 8 878 | 308 294 | 97.1 | 2.9 | 100.0 |
| Total | 847 418 | 18 256 | 865 674 | 97.9 | 2.1 | 100.0 |
| Female | ||||||
| 15–19 | 237 036 | 3 503 | 240 539 | 98.5 | 1.5 | 100.0 |
| 20–24 | 288 390 | 2 313 | 290 704 | 99.2 | 0.8 | 100.0 |
| 25–29 | 288 618 | 5 456 | 294 073 | 98.1 | 1.9 | 100.0 |
| Total | 814 044 | 11 272 | 825 316 | 98.6 | 1.4 | 100.0 |