Table 2. Nonalcoholic steatohepatitis activity score.

Score	Hepatic Steatosis (0–3)	Hepatocyte Ballooning (0–2)	Lobular Inflammation (0–3)
0	<5%	None	No foci
1	5–33%	A few	1–2 foci per 200× field
2	33–66%	many cells	2–4 foci per 200× field
3	>66%	/	>4 foci per 200× field