Target population and response rates in three school surveys and in four follow-ups
| Survey | Time | Age | Target population (N) | Number of respondents (N) Total Women Men | Response rate for the target population (%) | Died (N) | Address was available (N) | Response rate for the contacted population (%) |
| School survey I | December 1981 | 14 | 2287 | 2242 1095 1147 | 98.0 | – | – | – |
| School survey II | May 1982 | 15 | 2291 | 2191 1074 1117 | 95.6 | – | – | – |
| School survey III | May 1983 | 16 | 2269 | 2194 1071 1123 | 96.7 | – | – | – |
| Follow-up I | Spring 1989 | 22 | 2194 | 1656 890 766 | 75.5 | 4 | 2139 | 77.4 |
| Follow-up II | Spring 1999 | 32 | 2194 | 1471 805 666 | 67.0 | 22 | 2091 | 70.4 |
| Follow-up III | Spring 2009 | 42 | 2194 | 1334 734 600 | 60.8 | 45 | 2117 | 63.0 |
| Follow-up IV | Spring 2019 | 52 | 2194 | 1160 648 512 | 52.9 | 85 | 2059 | 56.3 |