VMA for children < 6months was 1.8-12 .2 mol/mmol ; 6months to < 1year was 1.5-9 .3 mol/mmol ; 1 to 5years was 1.9-7 .8 mol/mmol ; 6 to 10years was 1.6-5 .1 mol/mmol ; and 11 to 15years was < 0.9-6 .3 mol/mmol .