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Subjects Located by Property Tax 77
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200 subjects 6th grade Age and Latency applied in series biased sample birthplace DMV search drivers license drivers records epidemiologic female subjects four methods four tracing methods Greenland historical cohort studies investigators length of exposure listed located and non-located located group LOCATED LOCATED TOTAL located males located subjects loss to follow-up males and females mobility variables MONTHS OF EXPOSURE non-located subjects number of subjects older subjects over-represented p-value Parents Located Property Tax rolls proportion of subjects Pupil Record Card residence response bias sample of 200 Santa Clarita Valley Saugus area Saugus Elementary School Saugus School District school records selected for subjects selection bias Spanish surnamed subjects STARTING MONTH Stratifying study subjects subgroups Subjects Located subjects were located Table 26 Telephone Book search total sample TRACING METHOD CHARACTERISTICS Tracing Methods Applied tracing the parents tracing the students Vinyl Chloride Study Voter Reg Voter Registration rolls Voter Rolls