Moderate3
Mild2
None1
Grade 3-43
Grade 1-22
<28 (<2.8)3
28-35 (2.8-3.5)2
>35 (>3.5)1
>50 (>3)3
34-50 (2-3)2
<34 (<2)1
>2.3 OR >63
1.7-2.3 OR 4-62
<1.7 OR <41
Source: Christensen E, Schlichting P, et al. Hepatology. 1984; 4(3):430-5.