. 2012 Dec 20;27(1):29–36. doi: 10.7555/JBR.27.20120047

Table 1. Changes of learning ability in different groups of rats (trial numbers).

Groups	Before treatment	After teatment
Groups	Before treatment	2 weeks	4 weeks	6 weeks	8 weeks
Control	46.7±8.2	45.0±5.5	48.3±4.1	46.7±5.2	50.0±6.3
Gal	50.0±8.9	55.0±5.5	60.0±8.9	70.0±8.9**	76.7±5.2**
EGB-L	48.3±7.5	53.3±8.2	55.0±5.5	68.3±7.5**	73.3±8.2**
EGB-M	45.0±8.4	48.3±7.5	53.3±5.2	53.3±5.2^##	56.7±8.2^##
EGB-H	45.0±5.5	50.0±6.3	51.2±7.5	50.0±6.3^##	51.7±4.1^##

Gal: rats in the galactose group were treated with D-galactose (100 mg/kg, peritoneal injection each day). EGB-L: rats in the low-dose Ginkgo biloba leaf extract group received 0.875 mg/kg Ginkgo biloba leaf extract. EGB-M: rats in the middle-dose Ginkgo biloba leaf extract group received 1.75 mg/kg Ginkgo biloba leaf extract. EGB-H, rats in the high-dose Ginkgo biloba leaf extract group received 3.5 mg/kg biloba leaf extract. *P < 0.05, **P < 0.01 vs Control group; ^#P < 0.05, ^##P < 0.01 vs Gal group.