TITLE

Effect of Instrument Precision on Estimation of Low Birth Weight Prevalence

AUTHOR(S)
Mullany, Luke C; Darmstadt, Gary L; Katz, Joanne; Khatry, Subarna K; Tielsch, James M
PUB. DATE
January 2005
SOURCE
Journal of Perinatology;Jan2005, Vol. 25 Issue 1, p11
SOURCE TYPE
Academic Journal
DOC. TYPE
Abstract
ABSTRACT
OBJECTIVE:: Reductions in prevalence of low birth weight (LBW) are likely to be achieved only through small increments, amplifying the importance of precision of measurement. This study compared two instruments for measuring birth weight to investigate the effect of instrument precision on estimates of LBW prevalence. STUDY DESIGN:: Analysis was based on 497 infants born to mothers enrolled in an ongoing community-based trial of the effect of umbilical cord and skin antisepsis on neonatal mortality in Nepal. For each child, two birth weight measurements were recorded within 72 hours after delivery using weighing scales of differing precisions (100 vs 2?g). RESULTS:: While continuous measures between the two instruments were similar, the prevalence of LBW among lower precision measurements (30%) was 11.3%lower than for higher precision measurements (34%). The difference in precision between the instruments accounted for 96%of the difference in LBW prevalence estimates. CONCLUSIONS:: Differences in estimated LBW rates may be entirely due to differences in instrument precision. Conclusions concerning programmatic or research intervention impact, or comparisons of rates across populations should consider the effect of instrument precision on estimates of LBW.Journal of Perinatology (2005) 25, 11-13. doi:10.1038/sj.jp.7211209 Published online 7 October 2004
ACCESSION #
15417510

 

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