In total, 1908 events which were selected from the JMA catalog were able to be located.
Not all participants with abnormal laboratory HbA1c measurements were able to be located for follow-up repeat laboratory HbA1c tests.
With respect to errors in recording addresses in the aforementioned documents, the address was able to be located in 90% of notified cases.
Of the 2,409 potentially eligible controls, 2,046 were able to be located and contacted, and 1,057 (52%) of these subjects participated.
Two other sources cited in the article, Staten Island mechanic Steve Ferrello and attorney Mark Simnon, were not able to be located.
Women who refused or were not able to be located were censored at the age at last follow-up (1996 1998).
At least 1 member of 15 pairs either declined or was not able to be located, and 5 pairs were excluded for gastrointestinal illness or recent use of certain medications in at least 1 member, leaving 13 pairs.
For subjects or next of kin who were not able to be located for an interview (n = 189, 33%), we used triangulation methods incorporating records from the county assessor's office and SLVDS tracking database to reconstruct residential history.
Of the 6,720 women included in the extended follow-up because they had one or more vials of serum remaining, 6,131 (91%) were located as either alive or dead, 589 (9%) were not able to be located, 59 (< 1%) refused to participate, and 49 (< 1%) were too ill to participate.
This way, if a participant is not able to be located after the first year, for example, the data collected from the participant up to one year will be used in estimating the intervention effect and will contribute to the time trend estimates up to a year.
