Table 3

Mean Sales Index for All Cases

Variable	Previous Year	Base Year	Number of Years without Advertising
Variable	Previous Year	Base Year	1	2	3	4	5	6	7	8	9	10
Number of cases	57	57	57	34	17	12	11	6	6	4	2	1
Mean sales index	113	100	84	75	64	46	42	37	32	28	29	34
Standard deviation	53	0	33	50	42	30	24	25	23	18	7	—
% Declining^{^a}	—	—	53	62	71	100	100	100	100	100	100	100

↵^aCases with an index of 90 or less relative to the last advertised year were classified as declining after cessation.