Birth to 3 days : 1-20
3-30 days:0.5-6.5
1-5 month : 0.5-6
6 month - 18 years : 0.5-4.5

> 18 years : 0.4-4.5

Pregnant women :
First trimester : 0.1-2.5
Second trimester : 0.2-2.5
Third trimester : 0.3-3.0