Table F.11Calculating PPV and NPV using age 25 years or older as a risk factor screen

ParameterValueSource
Total births645 835ONS
Total births ≥ 25 years478 860ONS
Gestational diabetes prevalence3.5%GDG estimate
Gestational diabetes births (0.035 × 645 835)22 604Calculated
Proportion detected ≥ 25 years85%Coustan (1993)957
Gestational diabetes detected (0.85 × 22 604)19 214Calculated
PPV (19 214/478 860)4.01%Calculated
NPV (163 585/166 975)98.0%Calculated

From: Appendix F, Economic model: screening and treatment of gestational diabetes

Cover of Antenatal Care
Antenatal Care: Routine Care for the Healthy Pregnant Woman.
NICE Clinical Guidelines, No. 62.
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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