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PLoS By Category | Recent PLoS Articles
Obstetrics - Public Health and Epidemiology - Women's Health

Evaluation of the London Measure of Unplanned Pregnancy in a United States Population of Women
Published: Thursday, April 19, 2012
Author: Diane Morof et al.

by Diane Morof, Jody Steinauer, Sadia Haider, Sonia Liu, Philip Darney, Geraldine Barrett

Objective

To evaluate the reliability and validity of the London Measure of Unplanned Pregnancy (a U.K.-developed measure of pregnancy intention), in English and Spanish translation, in a U.S. population of women.

Methods

A psychometric evaluation study of the London Measure of Unplanned Pregnancy (LMUP), a six-item, self-completion paper measure was conducted with 346 women aged 15–45 who presented to San Francisco General Hospital for termination of pregnancy or antenatal care. Analyses of the two language versions were carried out separately. Reliability (internal consistency) was assessed using Cronbach's alpha and item-total correlations. Test-retest reliability (stability) was assessed using weighted Kappa. Construct validity was assessed using principal components analysis and hypothesis testing.

Results

Psychometric testing demonstrated that the LMUP was reliable and valid in both U.S. English (alpha?=?0.78, all item-total correlations >0.20, weighted Kappa?=?0.72, unidimensionality confirmed, hypotheses met) and Spanish translation (alpha?=?0.84, all item-total correlations >0.20, weighted Kappa?=?0.77, unidimensionality confirmed, hypotheses met).

Conclusion

The LMUP was reliable and valid in U.S. English and Spanish translation and therefore may now be used with U.S. women.

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