Table 1.

Ages and treatment times of study animals

Dog	Date	Animal	Treatment	Age at Start of Study (yrs)	Age at End of Study (yrs)	Duration of Intervention (yrs)	Cause of Death
1494D	10/15/01	1	C/C	12.1	15.0	2.8	Study End
1508U	10/15/01	2	C/C	11.4	13.5	1.9	*Congestive heart failure
1510A	10/15/01	3	C/C	11.3	14.2	2.7	Study End
1521S	10/15/01	4	C/C	10.7	13.6	2.8	Study End
1543S	10/15/01	5	C/C	10.1	13.0	2.8	Study End
B2150	10/15/01	6	C/C	11.6	14.5	2.8	Study End
Mean C/C				11.2	14.0	2.6
1492B	10/15/01	7	E/C	12.1	12.5	0.3	*Liver degeneration, pancreatitis
1506B	10/15/01	8	E/C	11.5	14.4	2.8	Study End
1518D	10/15/01	9	E/C	10.8	13.7	2.8	Study End
1523U	10/15/01	10	E/C	9.6	12.2	2.5	Anorexia
1529S	10/15/01	11	E/C	10.4	13.3	2.8	Study End
1542S	10/15/01	12	E/C	10.1	13.0	2.8	Study End
Mean E/C				10.7	13.2	2.3
1491B	10/15/01	13	C/A	12.1	15.0	2.7	Study End
1508A	10/15/01	14	C/A	11.4	14.3	2.8	Study End
1509U	10/15/01	15	C/A	11.3	13.8	2.4	Abscess in left axilla
1523B	10/15/01	16	C/A	9.6	12.5	2.7	Study End
1532S	10/15/01	17	C/A	10.4	13.3	2.8	Study End
1581S	10/15/01	18	C/A	8.1	11.0	2.7	Study End
Mean C/A				10.5	13.3	2.7
1502S	10/15/01	19	E/A	11.9	14.8	2.8	Study End
1521B	10/15/01	20	E/A	10.7	13.6	2.7	Study End
1541B	10/15/01	21	E/A	10.1	13.0	2.7	Study End
1542T	10/15/01	22	E/A	10.1	13.0	2.8	Study End
1581T	10/15/01	23	E/A	8.1	11.0	2.7	Study End
1585A	10/15/01	24	E/A	7.8	10.7	2.7	Study End
Mean E/A				10.5	13.3	2.7

C/C - control enrichment/control diet

E/C - behavioral enrichment/control diet

C/A - control enrichment/antioxidant diet

E/A - behavioral enrichment/antioxidant diet