Table 1 Age, number and response rates of the study subjects
Baseline yearAge at follow-up in 2001Age at baselineParticipants (n)Response rate (%)
(years)(years)MaleFemaleMaleFemale
19872914167417898189
3116138314798089
3318101212747489
198927143604317590
29163623807082
31183264076380
19912514162918377487
2716156219127187
2918128616266182
19932314186120087588
2516165519437187
2718146017916784
19952114117713017585
2316123214697288
2518107113136786
19971914116813466984
2116112613796887
2318108814146083
Total21432250997186