1996
DOI: 10.1001/jama.1996.03530260027026
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Adolescents With Negative Pregnancy Test Results

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Cited by 46 publications
(8 citation statements)
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“…The pregnancy rates in the power calculation were based on data collected by Zabin et al [4] from the mid-1980s (56% of the adolescents in their sample subsequently became pregnant within the 18 months after an NPT) and the national estimated incidence of adolescent pregnancy (20%) in urban minority women under the age of 19 at the time of the study [6]. Calculations for the appropriate sample size for a survival analysis of pregnancy rates, comparing a single survival distribution with a standard distribution, also were based on the Zabin et al [3] study. Their percentage (56%) was used to calculate the hazard ratio (␦) divided by 100 minus the hazard (44%).…”
Section: Samplementioning
confidence: 99%
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“…The pregnancy rates in the power calculation were based on data collected by Zabin et al [4] from the mid-1980s (56% of the adolescents in their sample subsequently became pregnant within the 18 months after an NPT) and the national estimated incidence of adolescent pregnancy (20%) in urban minority women under the age of 19 at the time of the study [6]. Calculations for the appropriate sample size for a survival analysis of pregnancy rates, comparing a single survival distribution with a standard distribution, also were based on the Zabin et al [3] study. Their percentage (56%) was used to calculate the hazard ratio (␦) divided by 100 minus the hazard (44%).…”
Section: Samplementioning
confidence: 99%
“…The variables were based on those reported by Zabin et al [3,4] and included demographic information, contraception use, pregnancy outcomes, and the use of reproductive health care. Initial trials of the instrument were performed independently by 3 different members of the research team to address issues of validity and reliability.…”
Section: Data Collection Instrumentmentioning
confidence: 99%
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