From: Determinants of daily smoking in Turkish young adults in the Netherlands
1993 | 1198 | Random sample (4–18 y) |  |  |
 |  |  | 19 | Did not fulfill inclusion criteria |
 |  |  | 113 | Incorrect address provided |
 | 1066 | Eligible |  |  |
2003 | 1066 | Target sample (14–28 y) |  |  |
 |  |  | Loss to follow-up (9% of 1066) | |
 |  |  | 72 | Tracing unsuccessful |
 |  |  | 2 | Deceased |
 |  |  | 18 | Moved out of region |
 | 974 | Approached (91% of 1066) |  |  |
 |  |  | 6 | Did not meet inclusion criteria |
 | 968 | Eligible | Non-response | |
 |  |  | 168 | Refusal |
 |  |  | 97 | Unreachable a |
 |  |  | 64 | Incorrect address |
 |  |  | 18 | Other reasons |
 | 621 | Respondents (14–28 y) (64% of 968) | 184 | 14–17 years old |
 | 437 | Respondents (18–28 y) |  |  |