12 weeks:0.2-0.8
13 weeks:0.2-1.0
14 weeks:0.3-1.4
15 weeks:0.5-3.0
16 weeks :0.7-4.0
17 weeks :0.7-4.0
18 weeks :0.75-5.5
19 weeks :0.8-8.0
20 weeks :1.1-9.0
21 weeks :1.3-10.0
male/female(non pregnant) : <1.0