Use of an Intensity Ratio to Describe Breastfeeding Exclusivity in a National Sample

Abstract

Breastfeeding behavior in a sample of 1863 mother-infant pairswas examined using data from the 1988 National Maternal-Infant Health Survey. Breastfeeding behavior was operationalized as an intensity ratio, calculated as the number of breast milk feeds (on average in 24 hours) divided by the total number of all liquid feeds (on average in 24 hours), with a range from 0 to 1.0. During the first month postpartum, 61% of the sample reported exclusive breastfeeding, declining to 31% during months 2-3 postpartum and to 13% during months 4-6 postpartum. This declinewas consistent with the linear decline in the mean intensity ratio, .82, .55, and .31, respectively, during the same three time periods. A higher breastfeeding intensity ratio was significantly associated with longer duration of breastfeeding, up to 1 year of life. Intensity ratio, as a measure of exclusivity, is a useful outcome measure for monitoring breastfeeding behavior.

Keywords

breastfeeding feeding patterns exclusive breastfeeding

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References

Raisler J , Alexander C , O'Campo P . Breastfeeding and infant illness: a dose response relationship? Am J Public Health. 1999;89:25-30.

Ford K , Labbok M . Breastfeeding and child health in the United States. J Biosoc Sci. 1993;25:187-194.

Cunningham AS , Jelliffe DB , Jelliffe EFP . Breastfeeding and health in the 1980s: a global epidemiological review. J Pediatr. 1991;118:659-666.

Howie PW , Forsyth JS , Ogston SA , et al. Protective effect of breastfeeding against infection. Br Med J. 1990;300:11-16.

Kramer MS . Does breastfeeding help protect against atopic disease? Biology, methodology, and a golden jubilee of controversy. J Pediatr. 1988;112:181-190.

Bauchner H , Leventhal JM , Shapiro ED . Studies of breastfeeding and infections: how good is the evidence? JAMA. 1986;256:887-892.

Ryan AS . The resurgence of breastfeeding in the United States. Pediatrics. 1997;99:e12-e12.

Labbok M , Krasovec K . Toward consistency in breastfeeding definitions. Stud Fam Plann. 1990;21:226-230.

Piper SL . Duration and Intensity of Breastfeeding as Predictors of Child Health Status After Weaning[dissertation]. Baltimore: University of Maryland at Baltimore; 1996.

10.

Piper S , Parks PL . Predicting the duration of lactation: evidence from a national survey. Birth. 1996;23(1):7-12.

11.

Kurinij N , Shiono PH , Rhoads GG . Breastfeeding incidence and duration in black and white women. Pediatrics 1988; 81:365-371.

12.

Goodine LA , Fried PA . Infant feeding practices: pre and postnatal factors affecting choice of method and the duration of breastfeeding. Can J Public Health.1984;75:439-444.