Table 1

Parameter estimates from quarterly time series analysis for US cigarette sales and nicotine replacement product sales (1976 to 1998, quarterly data, n = 89)

Variable	Coefficient	Standard error
Nicotine gums and patches sales	−0.004^1-150	0.002
Cigarette price	−0.260^1-150	0.114
Time trend	−0.002^1-150	0.001
First quarter	0.015	0.031
Second quarter	0.060^1-160	0.016
Third quarter	0.008	0.031
Dummy 1992	−0.076	0.030
Dummy 1996	−0.040	0.033
Constant	7.967^1-160	0.520

↵1-150 p < 0.05 by two tailed test;
↵1-160 p < 0.01 by two tailed test.