Participants lost to follow-up were significantly older, a difference that was due primarily to the design decision not to follow wave 1 seniors at wave 2 It furthers the University's objective of excellence in research, scholarship, and education by publishing worldwide. Moodley P, Sturm AW. Approximately 8 percent of wave 3 Add Health respondents refused to provide a urine sample, which may have introduced bias if persons who refused had different prevalence patterns than other respondents. Because the wave 3 data on STI biologic tests were cross-sectional, some of the observed associations may represent cohort differences rather than developmental change between the ages of 18 and 23 years.
A nationally representative sample of 9, respondents aged 18—26 years was tested for chlamydial infection, gonorrhea, and trichomoniasis in wave 3 — of the National Longitudinal Study of Adolescent Health.
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Moodley P, Sturm AW. Of those, 9, had complete data on our variables of interest, with almost all of the missing data being attributable to respondents' lacking results for the biologic STI laboratory tests approximately 8 percent of respondents chose not to provide a specimen; approximately 2 percent were unable to provide a specimen at the time of the interview; 3 percent of specimens could not be processed because of shipping and laboratory problems; and 6 percent of the N. J Public Health Policy. Richard Udry, Peter S. Because many STIs are asymptomatic and self-reports of symptoms correlate poorly with biologic tests for STI, using self-reports probably results in substantial underreporting of STI Furthermore, although the sexual network structures may have differed somewhat between these infections, the sexual behavioral risks were likely to have been similar.