Table 1.

Hydrocephalic rat groups studied (along with age-matched controls)

Age at kaolin injection	Duration of hydrocephalus	Age at sacrifice
1 day	1 week	1 week
1 day	3 weeks	3 weeks
3 weeks	3–4 weeks	7 weeks
10 weeks	2 weeks	12 weeks
3 weeks	9 months	10 months

In the text we refer to the age at time of sacrifice