TABLE 1.

—Smoking Characteristics of 3676 Women, by Age Groups: Geneva, Switzerland, 1992–1998

	Age Groups, y
Characteristics	35–44	45–54	55–64	65–74	All	P
n	1077	1194	825	580	3676
% Never smokers	43.3	52.3	65.3	68.1	55.1
% Past smokers	24.0	23.3	17.7	17.6	21.3	}<.001a
% Current smokers	32.7	24.5	17.0	14.3	23.6
% Ever smokers	56.7	47.7	34.7	31.9	44.9	<.001b
Age initiated smoking, yc	18	19	20	20	19	<.001d
Number of cigarettes per dayc	13.6	12.7	12.5	10.0	12.6	<.09e
Duration of smoking, ya	17	22	29	36	21	<.001e
Mean number of quit attempts among ever smokers	0.86	0.83	0.80	0.78	0.83	.65e
Mean number of quit attempts among women who attempted to quit at least once	1.36	1.27	1.26	1.26	1.30	<.03e

^aχ²₆ , never vs past vs current smokers.

^bχ²₃, ever vs never smokers.

^cMedian, among ever smokers only.

^dLog-rank (χ² approx), 3 df.

^eKruskal–Wallis (χ² approx), 3 df.