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This Article Full Text Full Text (PDF) All Versions of this Article: AJPH.2006.094789v1 96/11/1899    most recent Submit a response View Shopping Cart Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Schempf, A. Articles by Becker, S. Search for Related Content PubMed PubMed Citation Articles by Schempf, A. Articles by Becker, S. Related Collections Birth Outcomes Other Statistics/Evaluation/Research

Ashley Schempf, BS and Stan Becker, PhD

The authors are with the Department of Population, Family, and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Md.

Correspondence: Requests for reprints should be sent to Ashley Schempf, BS, Department of Population, Family, and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, 615 N Wolfe St, Baltimore, MD 21205 (e-mail: aschempf@jhsph.edu).

	Because this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

Yang et al.¹ applied an underutilized demographic technique, developed by Kitagawa,² to decompose temporal trends in low birth-weight (LBW) into changes in the distribution of maternal age and parity versus changes in the age- and parity-specific rates of LBW. The authors concluded that temporal increases in LBW were largely the result of changes in age- and parity-specific rates rather than age–parity distributional shifts. The applied method, which elegantly partitions the difference between 2 aggregate rates into differences in factor-specific rates and differences in factor distribution, requires a population standard to which differences in factor-specific rates and proportions are weighted. Although . . . [Full Text]

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