London Measure of Unplanned Pregnancy and newer family forms: an update

The London Measure of Unplanned Pregnancy (LMUP), a psychometric measure of pregnancy intention based on lay views, was published in this journal in 2004¹ and is now validated in 15 languages.² Since its development, there has been a growth in same-sex couples having children, women choosing to become mothers without a partner and non-romantic partners choosing to become parents together.³ The LMUP is intended to be suitable for all pregnant women and item 5 (about partner discussion) is potentially exclusionary. We aimed to update item 5 to incorporate newer family forms.

Our study’s first stage was qualitative, comprising cognitive interviews to generate and test amendments to item 5. The second, quantitative, stage aimed to assess the basic psychometric properties of the updated LMUP. We considered >5% to be an unacceptable level of missing data.⁴ Data collection was via the P3 Study.

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