"Figure 4: The percentage of live births born at under 24 weeks completed gestation has increased since 2015","" "Proportion of live births under 24 weeks completed gestation, England and Wales, 2009 to 2018","" "","" "Notes","1. Gestational age in completed weeks is recorded for all live births on the NHS Birth Notifications system. It is not available for live births from registration data. Gestational age is highly correlated with birthweight. 2. For gestational age below 22 weeks, birthweight was checked and was considered ""inconsistent"" for values of 1,000 grams or more." "Unit","%" "","" "","Under 22 weeks and birthweight less than 1,000g","22 weeks","23 weeks","Total under 24 weeks" "2009","0.03","0.02","0.04","0.09" "2010","0.03","0.02","0.05","0.10" "2011","0.03","0.02","0.04","0.10" "2012","0.04","0.02","0.04","0.10" "2013","0.04","0.02","0.04","0.10" "2014","0.03","0.02","0.05","0.10" "2015","0.04","0.02","0.04","0.10" "2016","0.05","0.03","0.04","0.12" "2017","0.05","0.03","0.05","0.13" "2018","0.06","0.03","0.05","0.13"