Table D.12Calculating PPV and NPV using aged 30 years or older as a risk factor screen

Total births645 835ONS
Total births ≥ 30 years314 512ONS
Gestational diabetes prevalence3.5%GDG estimate
Gestational diabetes births (0.035 × 645 835)22 604Calculated
Proportion detected ≥ 30 years65%Coustan (1993)452
Gestational diabetes detected (0.65 × 22 604)14 693Calculated
PPV (14 693/314 512)4.7%Calculated
NPV (323 412/331 323)97.6%Calculated

From: Appendix D, Cost-effectiveness of screening, diagnosis and treatment for gestational diabetes

Cover of Diabetes in Pregnancy
Diabetes in Pregnancy: Management of Diabetes and Its Complications from Preconception to the Postnatal Period.
NICE Clinical Guidelines, No. 63.
National Collaborating Centre for Women's and Children's Health (UK).
London: RCOG Press; 2008 Mar.
Copyright © 2008, National Collaborating Centre for Women’s and Children’s Health.

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