"Chart 4: Singleton and multiple infant mortality rates by age of mother and grouped gestation, 2006-2010","" "","" "","" "Notes","" "Unit","Mortality rate per 1,000 live births" "","" "","Singleton, pre-term","Singleton, term","Multiple, pre-term","Multiple, term" "Under 20","36.2","2.6","49.2","4.9" "20-24","31.0","2.1","33.2","4.3" "25-29","27.3","1.7","26.3","3.1" "30-34","25.5","1.4","22.3","2.3" "35-39","25.2","1.5","20.8","2.8" "40+","27.1","2.2","23.0","2.5"