| N (%) |
---|---|
Eligible and invited | 192,931 |
  Response received (responders) | 76,932 (40%) |
  No response received | 115,039 (60%) |
  Lost to follow-up (mail returned undeliverable) | 960 (<1%) |
Responders | Â |
  Declined participation | 3,526 (2%) |
  Questionnaire completeda (participants) | 59,947 (31%)b |
  Incomplete questionnairec | 13,459 (7%) |
Participants | Â |
  Questionnaire only | 36,508 (61%) |
  Questionnaire and toenail sample | 23,439 (39%) |